// Copyright (c) 2004-2010 Sergey Lyubka
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include "stdafx.h"


#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#endif // !_WIN32_WCE

#include <time.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>

#if defined(_WIN32)  // Windows specific #includes and #defines
#include <windows.h>

#ifndef PATH_MAX
#define PATH_MAX MAX_PATH
#endif

#ifndef _WIN32_WCE
#include <process.h>
#include <direct.h>
#include <io.h>
#endif // _WIN32_WCE

#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
	((uint64_t)((uint32_t)(hi))) << 32))
#define RATE_DIFF 10000000 // 100 nsecs
#define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
#define SYS2UNIX_TIME(lo, hi) \
	(time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)

// Visual Studio 6 does not know __func__ or __FUNCTION__
// The rest of MS compilers use __FUNCTION__, not C99 __func__
// Also use _strtoui64 on modern M$ compilers
#if defined(_MSC_VER) && _MSC_VER < 1300
#define STRX(x) #x
#define STR(x) STRX(x)
#define __func__ "line " STR(__LINE__)
#define strtoull(x, y, z) strtoul(x, y, z)
#define strtoll(x, y, z) strtol(x, y, z)
#else
#define __func__  __FUNCTION__
#define strtoull(x, y, z) _strtoui64(x, y, z)
#define strtoll(x, y, z) _strtoi64(x, y, z)
#endif // _MSC_VER

#define ERRNO   GetLastError()
#define NO_SOCKLEN_T
#define SSL_LIB   "ssleay32.dll"
#define CRYPTO_LIB  "libeay32.dll"
#define DIRSEP '\\'
#define IS_DIRSEP_CHAR(c) ((c) == '/' || (c) == '\\')
#define O_NONBLOCK  0
#if !defined(EWOULDBLOCK)
#define EWOULDBLOCK  WSAEWOULDBLOCK
#endif // !EWOULDBLOCK
#define _POSIX_
#define INT64_FMT  "I64d"

#define WINCDECL __cdecl
#define SHUT_WR 1
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#define sleep(x) Sleep((x) * 1000)

#define pipe(x) _pipe(x, BUFSIZ, _O_BINARY)
#define popen(x, y) _popen(x, y)
#define pclose(x) _pclose(x)
#define close(x) _close(x)
#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
#define RTLD_LAZY  0
#define fseeko(x, y, z) fseek((x), (y), (z))
#define fdopen(x, y) _fdopen((x), (y))
#define write(x, y, z) _write((x), (y), (unsigned) z)
#define read(x, y, z) _read((x), (y), (unsigned) z)
#define flockfile(x) (void) 0
#define funlockfile(x) (void) 0

#if !defined(fileno)
#define fileno(x) _fileno(x)
#endif // !fileno MINGW #defines fileno

typedef HANDLE pthread_mutex_t;
typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
typedef DWORD pthread_t;
#define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.

struct timespec {
	long tv_nsec;
	long tv_sec;
};

static int pthread_mutex_lock(pthread_mutex_t *);
static int pthread_mutex_unlock(pthread_mutex_t *);
static FILE *mg_fopen(const char *path, const char *mode);

#if defined(HAVE_STDINT)
#include <stdint.h>
#else
typedef unsigned int  uint32_t;
typedef unsigned short  uint16_t;
typedef unsigned __int64 uint64_t;
typedef __int64   int64_t;
#define INT64_MAX  9223372036854775807
#endif // HAVE_STDINT

// POSIX dirent interface
struct dirent {
	char d_name[PATH_MAX];
};

typedef struct DIR {
	HANDLE   handle;
	WIN32_FIND_DATAW info;
	struct dirent  result;
} DIR;

#else    // UNIX  specific
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/mman.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <stdint.h>
#include <inttypes.h>
#include <netdb.h>

#include <pwd.h>
#include <unistd.h>
#include <dirent.h>
#include <dlfcn.h>
#include <pthread.h>
#if defined(__MACH__)
#define SSL_LIB   "libssl.dylib"
#define CRYPTO_LIB  "libcrypto.dylib"
#else
#define SSL_LIB   "libssl.so"
#define CRYPTO_LIB  "libcrypto.so"
#endif
#define DIRSEP   '/'
#define IS_DIRSEP_CHAR(c) ((c) == '/')
#define O_BINARY  0
#define closesocket(a) close(a)
#define mg_fopen(x, y) fopen(x, y)
#define mg_mkdir(x, y) mkdir(x, y)
#define mg_remove(x) remove(x)
#define mg_rename(x, y) rename(x, y)
#define ERRNO errno
#define INVALID_SOCKET (-1)
#define INT64_FMT PRId64
typedef int SOCKET;
#define WINCDECL

#endif // End of Windows and UNIX specific includes

#include "mongoose.h"

#define MONGOOSE_VERSION "2.11"
#define PASSWORDS_FILE_NAME ".htpasswd"
#define CGI_ENVIRONMENT_SIZE 4096
#define MAX_CGI_ENVIR_VARS 64
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))

#if defined(DEBUG)
#define DEBUG_TRACE(x) do { \
	flockfile(stdout); \
	printf("*** %lu.%p.%s.%d: ", \
	(unsigned long) time(NULL), (void *) pthread_self(), \
	__func__, __LINE__); \
	printf x; \
	putchar('\n'); \
	fflush(stdout); \
	funlockfile(stdout); \
} while (0)
#else
#define DEBUG_TRACE(x)
#endif // DEBUG

// Darwin prior to 7.0 and Win32 do not have socklen_t
#ifdef NO_SOCKLEN_T
typedef int socklen_t;
#endif // NO_SOCKLEN_T

typedef void * (*mg_thread_func_t)(void *);

static const char *http_500_error = "Internal Server Error";

// Snatched from OpenSSL includes. I put the prototypes here to be independent
// from the OpenSSL source installation. Having this, mongoose + SSL can be
// built on any system with binary SSL libraries installed.
typedef struct ssl_st SSL;
typedef struct ssl_method_st SSL_METHOD;
typedef struct ssl_ctx_st SSL_CTX;

#define SSL_ERROR_WANT_READ 2
#define SSL_ERROR_WANT_WRITE 3
#define SSL_FILETYPE_PEM 1
#define CRYPTO_LOCK  1

#if defined(NO_SSL_DL)
extern void SSL_free(SSL *);
extern int SSL_accept(SSL *);
extern int SSL_connect(SSL *);
extern int SSL_read(SSL *, void *, int);
extern int SSL_write(SSL *, const void *, int);
extern int SSL_get_error(const SSL *, int);
extern int SSL_set_fd(SSL *, int);
extern SSL *SSL_new(SSL_CTX *);
extern SSL_CTX *SSL_CTX_new(SSL_METHOD *);
extern SSL_METHOD *SSLv23_server_method(void);
extern int SSL_library_init(void);
extern void SSL_load_error_strings(void);
extern int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int);
extern int SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int);
extern int SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *);
extern void SSL_CTX_set_default_passwd_cb(SSL_CTX *, mg_callback_t);
extern void SSL_CTX_free(SSL_CTX *);
extern unsigned long ERR_get_error(void);
extern char *ERR_error_string(unsigned long, char *);
extern int CRYPTO_num_locks(void);
extern void CRYPTO_set_locking_callback(void (*)(int, int, const char *, int));
extern void CRYPTO_set_id_callback(unsigned long (*)(void));
#else
// Dynamically loaded SSL functionality
struct ssl_func {
	const char *name;   // SSL function name
	void  (*ptr)(void); // Function pointer
};

#define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
#define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
#define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
#define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
#define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
#define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5])
#define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
#define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
#define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
#define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
#define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
#define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
	const char *, int)) ssl_sw[11].ptr)
#define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
	const char *, int)) ssl_sw[12].ptr)
#define SSL_CTX_set_default_passwd_cb \
	(* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
#define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
#define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
#define SSL_CTX_use_certificate_chain_file \
	(* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)

#define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
#define CRYPTO_set_locking_callback \
	(* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
#define CRYPTO_set_id_callback \
	(* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
#define ERR_get_error (* (unsigned long (*)(void)) ssl_sw[3].ptr)
#define ERR_error_string (* (char * (*)(unsigned long, char *)) ssl_sw[4].ptr)

// set_ssl_option() function updates this array.
// It loads SSL library dynamically and changes NULLs to the actual addresses
// of respective functions. The macros above (like SSL_connect()) are really
// just calling these functions indirectly via the pointer.
static struct ssl_func ssl_sw[] = {
	{"SSL_free",   NULL},
	{"SSL_accept",   NULL},
	{"SSL_connect",   NULL},
	{"SSL_read",   NULL},
	{"SSL_write",   NULL},
	{"SSL_get_error",  NULL},
	{"SSL_set_fd",   NULL},
	{"SSL_new",   NULL},
	{"SSL_CTX_new",   NULL},
	{"SSLv23_server_method", NULL},
	{"SSL_library_init",  NULL},
	{"SSL_CTX_use_PrivateKey_file", NULL},
	{"SSL_CTX_use_certificate_file",NULL},
	{"SSL_CTX_set_default_passwd_cb",NULL},
	{"SSL_CTX_free",  NULL},
	{"SSL_load_error_strings", NULL},
	{"SSL_CTX_use_certificate_chain_file", NULL},
	{NULL,    NULL}
};

// Similar array as ssl_sw. These functions could be located in different lib.
static struct ssl_func crypto_sw[] = {
	{"CRYPTO_num_locks",  NULL},
	{"CRYPTO_set_locking_callback", NULL},
	{"CRYPTO_set_id_callback", NULL},
	{"ERR_get_error",  NULL},
	{"ERR_error_string", NULL},
	{NULL,    NULL}
};
#endif // NO_SSL_DL

static const char *month_names[] = {
	"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};

// Unified socket address. For IPv6 support, add IPv6 address structure
// in the union u.
struct usa {
	socklen_t len;
	union {
		struct sockaddr sa;
		struct sockaddr_in sin;
	} u;
};

// Describes a string (chunk of memory).
struct vec {
	const char *ptr;
	size_t len;
};

// Structure used by mg_stat() function. Uses 64 bit file length.
struct mgstat {
	int is_directory;  // Directory marker
	int64_t size;      // File size
	time_t mtime;      // Modification time
};

// Describes listening socket, or socket which was accept()-ed by the master
// thread and queued for future handling by the worker thread.
struct socket {
	struct socket *next;  // Linkage
	SOCKET sock;          // Listening socket
	struct usa lsa;       // Local socket address
	struct usa rsa;       // Remote socket address
	int is_ssl;           // Is socket SSL-ed
	int is_proxy;
};

enum {
	CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
	PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, ACCESS_LOG_FILE,
	SSL_CHAIN_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
	GLOBAL_PASSWORDS_FILE, INDEX_FILES,
	ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST, MAX_REQUEST_SIZE,
	EXTRA_MIME_TYPES, LISTENING_PORTS,
	DOCUMENT_ROOT, SSL_CERTIFICATE, NUM_THREADS, RUN_AS_USER,
	NUM_OPTIONS
};

static const char *config_options[] = {
	"C", "cgi_extensions", ".cgi,.pl,.php",
	"E", "cgi_environment", NULL,
	"G", "put_delete_passwords_file", NULL,
	"I", "cgi_interpreter", NULL,
	"P", "protect_uri", NULL,
	"R", "authentication_domain", "mydomain.com",
	"S", "ssi_extensions", ".shtml,.shtm",
	"a", "access_log_file", NULL,
	"c", "ssl_chain_file", NULL,
	"d", "enable_directory_listing", "yes",
	"e", "error_log_file", NULL,
	"g", "global_passwords_file", NULL,
	"i", "index_files", "index.html,index.htm,index.cgi",
	"k", "enable_keep_alive", "no",
	"l", "access_control_list", NULL,
	"M", "max_request_size", "16384",
	"m", "extra_mime_types", NULL,
	"p", "listening_ports", "8080",
	"r", "document_root",  ".",
	"s", "ssl_certificate", NULL,
	"t", "num_threads", "10",
	"u", "run_as_user", NULL,
	NULL
};
#define ENTRIES_PER_CONFIG_OPTION 3

struct mg_context {
	int stop_flag;                // Should we stop event loop
	SSL_CTX *ssl_ctx;             // SSL context
	char *config[NUM_OPTIONS];    // Mongoose configuration parameters
	mg_callback_t user_callback;  // User-defined callback function

	struct socket *listening_sockets;

	int num_threads;           // Number of threads
	pthread_mutex_t mutex;     // Protects (max|num)_threads
	pthread_cond_t  cond;      // Condvar for tracking workers terminations

	struct socket queue[20];   // Accepted sockets
	int sq_head;               // Head of the socket queue
	int sq_tail;               // Tail of the socket queue
	pthread_cond_t sq_full;    // Singaled when socket is produced
	pthread_cond_t sq_empty;   // Signaled when socket is consumed
};

struct mg_connection {
	struct mg_connection *peer; // Remote target in proxy mode
	struct mg_request_info request_info;
	struct mg_context *ctx;
	SSL *ssl;                   // SSL descriptor
	struct socket client;       // Connected client
	time_t birth_time;          // Time connection was accepted
	int64_t num_bytes_sent;     // Total bytes sent to client
	int64_t content_len;        // Content-Length header value
	int64_t consumed_content;   // How many bytes of content is already read
	char *buf;                  // Buffer for received data
	int buf_size;               // Buffer size
	int request_len;            // Size of the request + headers in a buffer
	int data_len;               // Total size of data in a buffer
};

UINT KrentoShow;
UINT KrentoHide;
UINT KrentoAbout;
UINT KrentoOptions;
UINT KrentoClose;
UINT PulsarShow;
UINT PulsarHide;
UINT KrentoHelp;


const char **mg_get_valid_option_names(void) {
	return config_options;
}

static void *call_user(struct mg_connection *conn, enum mg_event event) {
	return conn->ctx->user_callback == NULL ? NULL :
	conn->ctx->user_callback(event, conn, &conn->request_info);
}

static int get_option_index(const char *name) {
	int i;

	for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) {
		if (strcmp(config_options[i], name) == 0 ||
			strcmp(config_options[i + 1], name) == 0) {
				return i / ENTRIES_PER_CONFIG_OPTION;
		}
	}
	return -1;
}

const char *mg_get_option(const struct mg_context *ctx, const char *name) {
	int i;
	if ((i = get_option_index(name)) == -1) {
		return NULL;
	} else if (ctx->config[i] == NULL) {
		return "";
	} else {
		return ctx->config[i];
	}
}

// Print error message to the opened error log stream.
static void cry(struct mg_connection *conn, const char *fmt, ...) {
	char buf[BUFSIZ];
	va_list ap;
	FILE *fp;
	time_t timestamp;

	va_start(ap, fmt);
	(void) vsnprintf(buf, sizeof(buf), fmt, ap);
	va_end(ap);

	// Do not lock when getting the callback value, here and below.
	// I suppose this is fine, since function cannot disappear in the
	// same way string option can.
	conn->request_info.log_message = buf;
	if (call_user(conn, MG_EVENT_LOG) == NULL) {
		fp = conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
			mg_fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");

	if (fp != NULL) {
		flockfile(fp);
		timestamp = time(NULL);

		(void) fprintf(fp,
			"[%010lu] [error] [client %s] ",
			(unsigned long) timestamp,
			inet_ntoa(conn->client.rsa.u.sin.sin_addr));

		if (conn->request_info.request_method != NULL) {
			(void) fprintf(fp, "%s %s: ",
				conn->request_info.request_method,
				conn->request_info.uri);
		}

		(void) fprintf(fp, "%s", buf);
		fputc('\n', fp);
		funlockfile(fp);
		if (fp != stderr) {
			fclose(fp);
		}
	}
	}
	conn->request_info.log_message = NULL;
}

// Return OpenSSL error message
static const char *ssl_error(void) {
	unsigned long err;
	err = ERR_get_error();
	return err == 0 ? "" : ERR_error_string(err, NULL);
}

// Return fake connection structure. Used for logging, if connection
// is not applicable at the moment of logging.
static struct mg_connection *fc(struct mg_context *ctx) {
	static struct mg_connection fake_connection;
	fake_connection.ctx = ctx;
	return &fake_connection;
}

const char *mg_version(void) {
	return MONGOOSE_VERSION;
}

static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
	for (; *src != '\0' && n > 1; n--) {
		*dst++ = *src++;
	}
	*dst = '\0';
}

static int lowercase(const char *s) {
	return tolower(* (unsigned char *) s);
}

static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
	int diff = 0;

	if (len > 0)
		do {
			diff = lowercase(s1++) - lowercase(s2++);
		} while (diff == 0 && s1[-1] != '\0' && --len > 0);

	return diff;
}

static int mg_strcasecmp(const char *s1, const char *s2) {
	int diff;

	do {
		diff = lowercase(s1++) - lowercase(s2++);
	} while (diff == 0 && s1[-1] != '\0');

	return diff;
}

static char * mg_strndup(const char *ptr, size_t len) {
	char *p;

	if ((p = (char *) malloc(len + 1)) != NULL) {
		mg_strlcpy(p, ptr, len + 1);
	}

	return p;
}

static char * mg_strdup(const char *str) {
	return mg_strndup(str, strlen(str));
}

// Like snprintf(), but never returns negative value, or the value
// that is larger than a supplied buffer.
// Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
// in his audit report.
static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
						const char *fmt, va_list ap) {
							int n;

							if (buflen == 0)
								return 0;

							n = vsnprintf(buf, buflen, fmt, ap);

							if (n < 0) {
								cry(conn, "vsnprintf error");
								n = 0;
							} else if (n >= (int) buflen) {
								cry(conn, "truncating vsnprintf buffer: [%.*s]",
									n > 200 ? 200 : n, buf);
								n = (int) buflen - 1;
							}
							buf[n] = '\0';

							return n;
}

static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
					   const char *fmt, ...) {
						   va_list ap;
						   int n;

						   va_start(ap, fmt);
						   n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
						   va_end(ap);

						   return n;
}

// Skip the characters until one of the delimiters characters found.
// 0-terminate resulting word. Skip the rest of the delimiters if any.
// Advance pointer to buffer to the next word. Return found 0-terminated word.
static char *skip(char **buf, const char *delimiters) {
	char *p, *begin_word, *end_word, *end_delimiters;

	begin_word = *buf;
	end_word = begin_word + strcspn(begin_word, delimiters);
	end_delimiters = end_word + strspn(end_word, delimiters);

	for (p = end_word; p < end_delimiters; p++) {
		*p = '\0';
	}

	*buf = end_delimiters;

	return begin_word;
}

// Return HTTP header value, or NULL if not found.
static const char *get_header(const struct mg_request_info *ri,
							  const char *name) {
								  int i;

								  for (i = 0; i < ri->num_headers; i++)
									  if (!mg_strcasecmp(name, ri->http_headers[i].name))
										  return ri->http_headers[i].value;

								  return NULL;
}

const char *mg_get_header(const struct mg_connection *conn, const char *name) {
	return get_header(&conn->request_info, name);
}

// A helper function for traversing comma separated list of values.
// It returns a list pointer shifted to the next value, of NULL if the end
// of the list found.
// Value is stored in val vector. If value has form "x=y", then eq_val
// vector is initialized to point to the "y" part, and val vector length
// is adjusted to point only to "x".
static const char *next_option(const char *list, struct vec *val,
struct vec *eq_val) {
	if (list == NULL || *list == '\0') {
		/* End of the list */
		list = NULL;
	} else {
		val->ptr = list;
		if ((list = strchr(val->ptr, ',')) != NULL) {
			/* Comma found. Store length and shift the list ptr */
			val->len = list - val->ptr;
			list++;
		} else {
			/* This value is the last one */
			list = val->ptr + strlen(val->ptr);
			val->len = list - val->ptr;
		}

		if (eq_val != NULL) {
			/*
			* Value has form "x=y", adjust pointers and lengths
			* so that val points to "x", and eq_val points to "y".
			*/
			eq_val->len = 0;
			eq_val->ptr = (char *)memchr(val->ptr, '=', val->len);
			if (eq_val->ptr != NULL) {
				eq_val->ptr++;  /* Skip over '=' character */
				eq_val->len = val->ptr + val->len - eq_val->ptr;
				val->len = (eq_val->ptr - val->ptr) - 1;
			}
		}
	}

	return list;
}

#if !defined(NO_CGI)
static int match_extension(const char *path, const char *ext_list) {
	struct vec ext_vec;
	size_t path_len;

	path_len = strlen(path);

	while ((ext_list = next_option(ext_list, &ext_vec, NULL)) != NULL)
		if (ext_vec.len < path_len &&
			mg_strncasecmp(path + path_len - ext_vec.len,
			ext_vec.ptr, ext_vec.len) == 0)
			return 1;

	return 0;
}
#endif // !NO_CGI

// HTTP 1.1 assumes keep alive if "Connection:" header is not set
// This function must tolerate situations when connection info is not
// set up, for example if request parsing failed.
static int should_keep_alive(const struct mg_connection *conn) {
	const char *http_version = conn->request_info.http_version;
	const char *header = mg_get_header(conn, "Connection");
	return (header == NULL && http_version && !strcmp(http_version, "1.1")) ||
		(header != NULL && !strcmp(header, "keep-alive"));
}

static const char *suggest_connection_header(const struct mg_connection *conn) {
	return should_keep_alive(conn) ? "keep-alive" : "close";
}

static void send_http_error(struct mg_connection *conn, int status,
							const char *reason, const char *fmt, ...) {
								char buf[BUFSIZ];
								va_list ap;
								int len;

								conn->request_info.status_code = status;

								if (call_user(conn, MG_HTTP_ERROR) == NULL) {
									buf[0] = '\0';
									len = 0;

									/* Errors 1xx, 204 and 304 MUST NOT send a body */
									if (status > 199 && status != 204 && status != 304) {
										len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
										cry(conn, "%s", buf);
										buf[len++] = '\n';

										va_start(ap, fmt);
										len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
										va_end(ap);
									}
									DEBUG_TRACE(("[%s]", buf));

									mg_printf(conn, "HTTP/1.1 %d %s\r\n"
										"Content-Type: text/plain\r\n"
										"Content-Length: %d\r\n"
										"Connection: %s\r\n\r\n", status, reason, len,
										suggest_connection_header(conn));
									conn->num_bytes_sent += mg_printf(conn, "%s", buf);
								}
}

#ifdef _WIN32
static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
	unused = NULL;
	*mutex = CreateMutex(NULL, FALSE, NULL);
	return *mutex == NULL ? -1 : 0;
}

static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
	return CloseHandle(*mutex) == 0 ? -1 : 0;
}

static int pthread_mutex_lock(pthread_mutex_t *mutex) {
	return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
}

static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
	return ReleaseMutex(*mutex) == 0 ? -1 : 0;
}

static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
	unused = NULL;
	cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
	cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
	return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
}

static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
	HANDLE handles[] = {cv->signal, cv->broadcast};
	ReleaseMutex(*mutex);
	WaitForMultipleObjects(2, handles, FALSE, INFINITE);
	return ReleaseMutex(*mutex) == 0 ? -1 : 0;
}

static int pthread_cond_signal(pthread_cond_t *cv) {
	return SetEvent(cv->signal) == 0 ? -1 : 0;
}

static int pthread_cond_broadcast(pthread_cond_t *cv) {
	// Implementation with PulseEvent() has race condition, see
	// http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
	return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
}

static int pthread_cond_destroy(pthread_cond_t *cv) {
	return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
}

static pthread_t pthread_self(void) {
	return GetCurrentThreadId();
}

// For Windows, change all slashes to backslashes in path names.
static void change_slashes_to_backslashes(char *path) {
	int i;

	for (i = 0; path[i] != '\0'; i++) {
		if (path[i] == '/')
			path[i] = '\\';
		// i > 0 check is to preserve UNC paths, like \\server\file.txt
		if (path[i] == '\\' && i > 0)
			while (path[i + 1] == '\\' || path[i + 1] == '/')
				(void) memmove(path + i + 1,
				path + i + 2, strlen(path + i + 1));
	}
}

// Encode 'path' which is assumed UTF-8 string, into UNICODE string.
// wbuf and wbuf_len is a target buffer and its length.
static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
	char buf[PATH_MAX], *p;

	mg_strlcpy(buf, path, sizeof(buf));
	change_slashes_to_backslashes(buf);

	// Point p to the end of the file name
	p = buf + strlen(buf) - 1;

	// Trim trailing backslash character
	while (p > buf && *p == '\\' && p[-1] != ':') {
		*p-- = '\0';
	}

	// Protect from CGI code disclosure.
	// This is very nasty hole. Windows happily opens files with
	// some garbage in the end of file name. So fopen("a.cgi    ", "r")
	// actually opens "a.cgi", and does not return an error!
	if (*p == 0x20 ||               // No space at the end
		(*p == 0x2e && p > buf) ||  // No '.' but allow '.' as full path
		*p == 0x2b ||               // No '+'
		(*p & ~0x7f)) {             // And generally no non-ascii chars
			(void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf);
			buf[0] = '\0';
	}

	(void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
}

#if defined(_WIN32_WCE)
static time_t time(time_t *ptime) {
	time_t t;
	SYSTEMTIME st;
	FILETIME ft;

	GetSystemTime(&st);
	SystemTimeToFileTime(&st, &ft);
	t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);

	if (ptime != NULL) {
		*ptime = t;
	}

	return t;
}

static time_t mktime(struct tm *ptm) {
	SYSTEMTIME st;
	FILETIME ft, lft;

	st.wYear = ptm->tm_year + 1900;
	st.wMonth = ptm->tm_mon + 1;
	st.wDay = ptm->tm_mday;
	st.wHour = ptm->tm_hour;
	st.wMinute = ptm->tm_min;
	st.wSecond = ptm->tm_sec;
	st.wMilliseconds = 0;

	SystemTimeToFileTime(&st, &ft);
	LocalFileTimeToFileTime(&ft, &lft);
	return (time_t) ((MAKEUQUAD(lft.dwLowDateTime, lft.dwHighDateTime) -
		EPOCH_DIFF) / RATE_DIFF);
}

static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
	int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
	FILETIME ft, lft;
	SYSTEMTIME st;
	TIME_ZONE_INFORMATION tzinfo;

	if (ptm == NULL) {
		return NULL;
	}

	* (int64_t *) &ft = t;
	FileTimeToLocalFileTime(&ft, &lft);
	FileTimeToSystemTime(&lft, &st);
	ptm->tm_year = st.wYear - 1900;
	ptm->tm_mon = st.wMonth - 1;
	ptm->tm_wday = st.wDayOfWeek;
	ptm->tm_mday = st.wDay;
	ptm->tm_hour = st.wHour;
	ptm->tm_min = st.wMinute;
	ptm->tm_sec = st.wSecond;
	ptm->tm_yday = 0; // hope nobody uses this
	ptm->tm_isdst =
		GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;

	return ptm;
}

static size_t strftime(char *dst, size_t dst_size, const char *fmt,
					   const struct tm *tm) {
						   (void) snprintf(dst, dst_size, "implement strftime() for WinCE");
						   return 0;
}
#endif

static int mg_rename(const char* oldname, const char* newname) {
	wchar_t woldbuf[PATH_MAX];
	wchar_t wnewbuf[PATH_MAX];

	to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));
	to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));

	return MoveFileW(woldbuf, wnewbuf) ? 0 : -1;
}


static FILE *mg_fopen(const char *path, const char *mode) {
	wchar_t wbuf[PATH_MAX], wmode[20];

	to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
	MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));

	return _wfopen(wbuf, wmode);
}

static int mg_stat(const char *path, struct mgstat *stp) {
	int ok = -1; // Error
	wchar_t wbuf[PATH_MAX];
	WIN32_FILE_ATTRIBUTE_DATA info;

	to_unicode(path, wbuf, ARRAY_SIZE(wbuf));

	if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
		stp->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
		stp->mtime = SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime,
			info.ftLastWriteTime.dwHighDateTime);
		stp->is_directory =
			info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
		ok = 0;  // Success
	}

	return ok;
}

static int mg_remove(const char *path) {
	wchar_t wbuf[PATH_MAX];
	to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
	return DeleteFileW(wbuf) ? 0 : -1;
}

static int mg_mkdir(const char *path, int mode) {
	char buf[PATH_MAX];
	wchar_t wbuf[PATH_MAX];

	mode = 0; // Unused
	mg_strlcpy(buf, path, sizeof(buf));
	change_slashes_to_backslashes(buf);

	(void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf));

	return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
}

// Implementation of POSIX opendir/closedir/readdir for Windows.
static DIR * opendir(const char *name) {
	DIR *dir = NULL;
	wchar_t wpath[PATH_MAX];
	DWORD attrs;

	if (name == NULL) {
		SetLastError(ERROR_BAD_ARGUMENTS);
	} else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
		SetLastError(ERROR_NOT_ENOUGH_MEMORY);
	} else {
		to_unicode(name, wpath, ARRAY_SIZE(wpath));
		attrs = GetFileAttributesW(wpath);
		if (attrs != 0xFFFFFFFF &&
			((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
				(void) wcscat(wpath, L"\\*");
				dir->handle = FindFirstFileW(wpath, &dir->info);
				dir->result.d_name[0] = '\0';
		} else {
			free(dir);
			dir = NULL;
		}
	}

	return dir;
}

static int closedir(DIR *dir) {
	int result = 0;

	if (dir != NULL) {
		if (dir->handle != INVALID_HANDLE_VALUE)
			result = FindClose(dir->handle) ? 0 : -1;

		free(dir);
	} else {
		result = -1;
		SetLastError(ERROR_BAD_ARGUMENTS);
	}

	return result;
}

struct dirent * readdir(DIR *dir) {
	struct dirent *result = 0;

	if (dir) {
		if (dir->handle != INVALID_HANDLE_VALUE) {
			result = &dir->result;
			(void) WideCharToMultiByte(CP_UTF8, 0,
				dir->info.cFileName, -1, result->d_name,
				sizeof(result->d_name), NULL, NULL);

			if (!FindNextFileW(dir->handle, &dir->info)) {
				(void) FindClose(dir->handle);
				dir->handle = INVALID_HANDLE_VALUE;
			}

		} else {
			SetLastError(ERROR_FILE_NOT_FOUND);
		}
	} else {
		SetLastError(ERROR_BAD_ARGUMENTS);
	}

	return result;
}

#define set_close_on_exec(fd) // No FD_CLOEXEC on Windows

static int start_thread(struct mg_context *ctx, mg_thread_func_t func,
						void *param) {
							HANDLE hThread;
							ctx = NULL; // Unused

							hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE) func, param, 0,
								NULL);
							if (hThread != NULL) {
								(void) CloseHandle(hThread);
							}

							return hThread == NULL ? -1 : 0;
}

static HANDLE dlopen(const char *dll_name, int flags) {
	wchar_t wbuf[PATH_MAX];
	flags = 0; // Unused
	to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
	return LoadLibraryW(wbuf);
}

#if !defined(NO_CGI)
#define SIGKILL 0
static int kill(pid_t pid, int sig_num) {
	(void) TerminateProcess(pid, sig_num);
	(void) CloseHandle(pid);
	return 0;
}

static pid_t spawn_process(struct mg_connection *conn, const char *prog,
						   char *envblk, char *envp[], int fd_stdin,
						   int fd_stdout, const char *dir) {
							   HANDLE me;
							   char *p, *interp, cmdline[PATH_MAX], buf[PATH_MAX];
							   FILE *fp;
							   STARTUPINFOA si;
							   PROCESS_INFORMATION pi;

							   envp = NULL; // Unused

							   (void) memset(&si, 0, sizeof(si));
							   (void) memset(&pi, 0, sizeof(pi));

							   // TODO(lsm): redirect CGI errors to the error log file
							   si.cb  = sizeof(si);
							   si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
							   si.wShowWindow = SW_HIDE;

							   me = GetCurrentProcess();
							   (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
								   &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
							   (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
								   &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);

							   // If CGI file is a script, try to read the interpreter line
							   interp = conn->ctx->config[CGI_INTERPRETER];
							   if (interp == NULL) {
								   buf[2] = '\0';
								   if ((fp = fopen(cmdline, "r")) != NULL) {
									   (void) fgets(buf, sizeof(buf), fp);
									   if (buf[0] != '#' || buf[1] != '!') {
										   // First line does not start with "#!". Do not set interpreter.
										   buf[2] = '\0';
									   } else {
										   // Trim whitespaces in interpreter name
										   for (p = &buf[strlen(buf) - 1]; p > buf && isspace(*p); p--) {
											   *p = '\0';
										   }
									   }
									   (void) fclose(fp);
								   }
								   interp = buf + 2;
							   }

							   (void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s%c%s",
								   interp, interp[0] == '\0' ? "" : " ", dir, DIRSEP, prog);

							   DEBUG_TRACE(("Running [%s]", cmdline));
							   if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
								   CREATE_NEW_PROCESS_GROUP, envblk, dir, &si, &pi) == 0) {
									   cry(conn, "%s: CreateProcess(%s): %d",
										   __func__, cmdline, ERRNO);
									   pi.hProcess = (pid_t) -1;
							   } else {
								   (void) close(fd_stdin);
								   (void) close(fd_stdout);
							   }

							   (void) CloseHandle(si.hStdOutput);
							   (void) CloseHandle(si.hStdInput);
							   (void) CloseHandle(pi.hThread);

							   return (pid_t) pi.hProcess;
}
#endif /* !NO_CGI */

static int set_non_blocking_mode(SOCKET sock) {
	unsigned long on = 1;
	return ioctlsocket(sock, FIONBIO, &on);
}

#else
static int mg_stat(const char *path, struct mgstat *stp) {
	struct stat st;
	int ok;

	if (stat(path, &st) == 0) {
		ok = 0;
		stp->size = st.st_size;
		stp->mtime = st.st_mtime;
		stp->is_directory = S_ISDIR(st.st_mode);
	} else {
		ok = -1;
	}

	return ok;
}

static void set_close_on_exec(int fd) {
	(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
}

static int start_thread(struct mg_context *ctx, mg_thread_func_t func,
						void *param) {
							pthread_t thread_id;
							pthread_attr_t attr;
							int retval;

							(void) pthread_attr_init(&attr);
							(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
							// TODO(lsm): figure out why mongoose dies on Linux if next line is enabled
							// (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);

							if ((retval = pthread_create(&thread_id, &attr, func, param)) != 0) {
								cry(fc(ctx), "%s: %s", __func__, strerror(retval));
							}

							return retval;
}

#ifndef NO_CGI
static pid_t spawn_process(struct mg_connection *conn, const char *prog,
						   char *envblk, char *envp[], int fd_stdin,
						   int fd_stdout, const char *dir) {
							   pid_t pid;
							   const char *interp;

							   envblk = NULL; // Unused

							   if ((pid = fork()) == -1) {
								   // Parent
								   send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
							   } else if (pid == 0) {
								   // Child
								   if (chdir(dir) != 0) {
									   cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
								   } else if (dup2(fd_stdin, 0) == -1) {
									   cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
								   } else if (dup2(fd_stdout, 1) == -1) {
									   cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
								   } else {
									   (void) dup2(fd_stdout, 2);
									   (void) close(fd_stdin);
									   (void) close(fd_stdout);

									   // Execute CGI program. No need to lock: new process
									   interp = conn->ctx->config[CGI_INTERPRETER];
									   if (interp == NULL) {
										   (void) execle(prog, prog, NULL, envp);
										   cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
									   } else {
										   (void) execle(interp, interp, prog, NULL, envp);
										   cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
											   strerror(ERRNO));
									   }
								   }
								   exit(EXIT_FAILURE);
							   } else {
								   // Parent. Close stdio descriptors
								   (void) close(fd_stdin);
								   (void) close(fd_stdout);
							   }

							   return pid;
}
#endif // !NO_CGI

static int set_non_blocking_mode(SOCKET sock) {
	int flags;

	flags = fcntl(sock, F_GETFL, 0);
	(void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);

	return 0;
}
#endif // _WIN32

// Write data to the IO channel - opened file descriptor, socket or SSL
// descriptor. Return number of bytes written.
static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
					int64_t len) {
						int64_t sent;
						int n, k;

						sent = 0;
						while (sent < len) {

							/* How many bytes we send in this iteration */
							k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);

							if (ssl != NULL) {
								n = SSL_write(ssl, buf + sent, k);
							} else if (fp != NULL) {
								n = (int)fwrite(buf + sent, 1, k, fp);
								if (ferror(fp))
									n = -1;
							} else {
								n = send(sock, buf + sent, k, 0);
							}

							if (n < 0)
								break;

							sent += n;
						}

						return sent;
}

// Read from IO channel - opened file descriptor, socket, or SSL descriptor.
// Return number of bytes read.
static int pull(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int len) {
	int nread;

	if (ssl != NULL) {
		nread = SSL_read(ssl, buf, len);
	} else if (fp != NULL) {
		nread = (int)fread(buf, 1, (size_t) len, fp);
		if (ferror(fp))
			nread = -1;
	} else {
		nread = recv(sock, buf, (size_t) len, 0);
	}

	return nread;
}

int mg_read(struct mg_connection *conn, void *buf, size_t len) {
	int n, buffered_len, nread;
	const char *buffered;

	assert(conn->content_len >= conn->consumed_content);
	DEBUG_TRACE(("%p %zu %lld %lld", buf, len,
		conn->content_len, conn->consumed_content));
	nread = 0;
	if (strcmp(conn->request_info.request_method, "POST") == 0 &&
		conn->consumed_content < conn->content_len) {

			// Adjust number of bytes to read.
			int64_t to_read = conn->content_len - conn->consumed_content;
			if (to_read < (int64_t) len) {
				len = (int) to_read;
			}

			// How many bytes of data we have buffered in the request buffer?
			buffered = conn->buf + conn->request_len;
			buffered_len = conn->data_len - conn->request_len;
			assert(buffered_len >= 0);

			// Return buffered data back if we haven't done that yet.
			if (conn->consumed_content < (int64_t) buffered_len) {
				buffered_len -= (int) conn->consumed_content;
				if (len < (size_t) buffered_len) {
					buffered_len = (int)len;
				}
				memcpy(buf, buffered, buffered_len);
				len -= buffered_len;
				buf = (char *) buf + buffered_len;
				conn->consumed_content += buffered_len;
				nread = buffered_len;
			}

			// We have returned all buffered data. Read new data from the remote socket.
			while (len > 0) {
				n = pull(NULL, conn->client.sock, conn->ssl, (char *) buf, (int) len);
				if (n <= 0) {
					break;
				}
				buf = (char *) buf + n;
				conn->consumed_content += n;
				nread += n;
				len -= n;
			}
	}
	return nread;
}

int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
	return (int) push(NULL, conn->client.sock, conn->ssl,
		(const char *) buf, (int64_t) len);
}

int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
	char buf[BUFSIZ];
	int len;
	va_list ap;

	va_start(ap, fmt);
	len = mg_vsnprintf(conn, buf, sizeof(buf), fmt, ap);
	va_end(ap);

	return mg_write(conn, buf, len);
}

// URL-decode input buffer into destination buffer.
// 0-terminate the destination buffer. Return the length of decoded data.
// form-url-encoded data differs from URI encoding in a way that it
// uses '+' as character for space, see RFC 1866 section 8.2.1
// http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
static size_t url_decode(const char *src, size_t src_len, char *dst,
						 size_t dst_len, int is_form_url_encoded) {
							 size_t i, j;
							 int a, b;
#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')

							 for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
								 if (src[i] == '%' &&
									 isxdigit(* (unsigned char *) (src + i + 1)) &&
									 isxdigit(* (unsigned char *) (src + i + 2))) {
										 a = tolower(* (unsigned char *) (src + i + 1));
										 b = tolower(* (unsigned char *) (src + i + 2));
										 dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
										 i += 2;
								 } else if (is_form_url_encoded && src[i] == '+') {
									 dst[j] = ' ';
								 } else {
									 dst[j] = src[i];
								 }
							 }

							 dst[j] = '\0'; /* Null-terminate the destination */

							 return j;
}

// Scan given buffer and fetch the value of the given variable.
// It can be specified in query string, or in the POST data.
// Return NULL if the variable not found, or allocated 0-terminated value.
// It is caller's responsibility to free the returned value.
int mg_get_var(const char *buf, size_t buf_len, const char *name,
			   char *dst, size_t dst_len) {
				   const char *p, *e, *s;
				   size_t name_len, len;

				   name_len = strlen(name);
				   e = buf + buf_len;
				   len = -1;
				   dst[0] = '\0';

				   // buf is "var1=val1&var2=val2...". Find variable first
				   for (p = buf; p != NULL && p + name_len < e; p++) {
					   if ((p == buf || p[-1] == '&') && p[name_len] == '=' &&
						   !mg_strncasecmp(name, p, name_len)) {

							   // Point p to variable value
							   p += name_len + 1;

							   // Point s to the end of the value
							   s = (const char *) memchr(p, '&', e - p);
							   if (s == NULL) {
								   s = e;
							   }
							   assert(s >= p);

							   // Decode variable into destination buffer
							   if ((size_t) (s - p) < dst_len) {
								   len = url_decode(p, s - p, dst, dst_len, 1);
							   }
							   break;
					   }
				   }

				   return (int)len;
}

int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
				  char *dst, size_t dst_size) {
					  const char *s, *p, *end;
					  int name_len, len = -1;

					  dst[0] = '\0';
					  if ((s = mg_get_header(conn, "Cookie")) == NULL) {
						  return 0;
					  }

					  name_len = (int)strlen(cookie_name);
					  end = s + strlen(s);

					  for (; (s = strstr(s, cookie_name)) != NULL; s += name_len)
						  if (s[name_len] == '=') {
							  s += name_len + 1;
							  if ((p = strchr(s, ' ')) == NULL)
								  p = end;
							  if (p[-1] == ';')
								  p--;
							  if (*s == '"' && p[-1] == '"' && p > s + 1) {
								  s++;
								  p--;
							  }
							  if ((size_t) (p - s) < dst_size) {
								  len = (int)((p - s) + 1);
								  mg_strlcpy(dst, s, len);
							  }
							  break;
						  }

						  return len;
}

// Mongoose allows to specify multiple directories to serve,
// like /var/www,/~bob=/home/bob. That means that root directory depends on URI.
// This function returns root dir for given URI.
static int get_document_root(const struct mg_connection *conn,
struct vec *document_root) {
	const char *root, *uri;
	int len_of_matched_uri;
	struct vec uri_vec, path_vec;

	uri = conn->request_info.uri;
	len_of_matched_uri = 0;
	root = next_option(conn->ctx->config[DOCUMENT_ROOT], document_root, NULL);

	while ((root = next_option(root, &uri_vec, &path_vec)) != NULL) {
		if (memcmp(uri, uri_vec.ptr, uri_vec.len) == 0) {
			*document_root = path_vec;
			len_of_matched_uri = (int)uri_vec.len;
			break;
		}
	}

	return len_of_matched_uri;
}

static void convert_uri_to_file_name(struct mg_connection *conn,
									 const char *uri, char *buf,
									 size_t buf_len) {
										 struct vec vec;
										 int match_len;

										 match_len = get_document_root(conn, &vec);
										 mg_snprintf(conn, buf, buf_len, "%.*s%s", vec.len, vec.ptr, uri + match_len);

#ifdef _WIN32
										 change_slashes_to_backslashes(buf);
#endif /* _WIN32 */

										 DEBUG_TRACE(("[%s] -> [%s], [%.*s]", uri, buf, (int) vec.len, vec.ptr));
}

static int sslize(struct mg_connection *conn, int (*func)(SSL *)) {
	return (conn->ssl = SSL_new(conn->ctx->ssl_ctx)) != NULL &&
		SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
		func(conn->ssl) == 1;
}

struct mg_connection *mg_connect(struct mg_connection *conn,
	const char *host, int port, int use_ssl) {
		struct mg_connection *newconn = NULL;
		struct sockaddr_in sin;
		struct hostent *he;
		SOCKET sock;

		if (conn->ctx->ssl_ctx == NULL && use_ssl) {
			cry(conn, "%s: SSL is not initialized", __func__);
		} else if ((he = gethostbyname(host)) == NULL) {
			cry(conn, "%s: gethostbyname(%s): %s", __func__, host, strerror(ERRNO));
		} else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
			cry(conn, "%s: socket: %s", __func__, strerror(ERRNO));
		} else {
			sin.sin_family = AF_INET;
			sin.sin_port = htons((uint16_t) port);
			sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
			if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
				cry(conn, "%s: connect(%s:%d): %s", __func__, host, port,
					strerror(ERRNO));
				closesocket(sock);
			} else if ((newconn = (mg_connection *)calloc(1, sizeof(*newconn))) == NULL) {
				cry(conn, "%s: calloc: %s", __func__, strerror(ERRNO));
				closesocket(sock);
			} else {
				newconn->client.sock = sock;
				newconn->client.rsa.u.sin = sin;
				if (use_ssl) {
					sslize(newconn, SSL_connect);
				}
			}
		}

		return newconn;
}

// Check whether full request is buffered. Return:
//   -1  if request is malformed
//    0  if request is not yet fully buffered
//   >0  actual request length, including last \r\n\r\n
static int get_request_len(const char *buf, int buflen) {
	const char *s, *e;
	int len = 0;

	DEBUG_TRACE(("buf: %p, len: %d", buf, buflen));
	for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
		// Control characters are not allowed but >=128 is.
		if (!isprint(* (unsigned char *) s) && *s != '\r' &&
			*s != '\n' && * (unsigned char *) s < 128) {
				len = -1;
		} else if (s[0] == '\n' && s[1] == '\n') {
			len = (int) (s - buf) + 2;
		} else if (s[0] == '\n' && &s[1] < e &&
			s[1] == '\r' && s[2] == '\n') {
				len = (int) (s - buf) + 3;
		}

		return len;
}

// Convert month to the month number. Return -1 on error, or month number
static int month_number_to_month_name(const char *s) {
	size_t i;

	for (i = 0; i < ARRAY_SIZE(month_names); i++)
		if (!strcmp(s, month_names[i]))
			return (int) i;

	return -1;
}

// Parse date-time string, and return the corresponding time_t value
static time_t parse_date_string(const char *s) {
	time_t current_time;
	struct tm tm, *tmp;
	char mon[32];
	int sec, min, hour, mday, month, year;

	(void) memset(&tm, 0, sizeof(tm));
	sec = min = hour = mday = month = year = 0;

	if (((sscanf(s, "%d/%3s/%d %d:%d:%d",
		&mday, mon, &year, &hour, &min, &sec) == 6) ||
		(sscanf(s, "%d %3s %d %d:%d:%d",
		&mday, mon, &year, &hour, &min, &sec) == 6) ||
		(sscanf(s, "%*3s, %d %3s %d %d:%d:%d",
		&mday, mon, &year, &hour, &min, &sec) == 6) ||
		(sscanf(s, "%d-%3s-%d %d:%d:%d",
		&mday, mon, &year, &hour, &min, &sec) == 6)) &&
		(month = month_number_to_month_name(mon)) != -1) {
			tm.tm_mday = mday;
			tm.tm_mon = month;
			tm.tm_year = year;
			tm.tm_hour = hour;
			tm.tm_min = min;
			tm.tm_sec = sec;
	}

	if (tm.tm_year > 1900) {
		tm.tm_year -= 1900;
	} else if (tm.tm_year < 70) {
		tm.tm_year += 100;
	}

	// Set Daylight Saving Time field
	current_time = time(NULL);
	tmp = localtime(&current_time);
	tm.tm_isdst = tmp->tm_isdst;

	return mktime(&tm);
}

// Protect against directory disclosure attack by removing '..',
// excessive '/' and '\' characters
static void remove_double_dots_and_double_slashes(char *s) {
	char *p = s;

	while (*s != '\0') {
		*p++ = *s++;
		if (s[-1] == '/' || s[-1] == '\\') {
			// Skip all following slashes and backslashes
			while (*s == '/' || *s == '\\') {
				s++;
			}

			// Skip all double-dots
			while (*s == '.' && s[1] == '.') {
				s += 2;
			}
		}
	}
	*p = '\0';
}

static const struct {
	const char *extension;
	size_t ext_len;
	const char *mime_type;
	size_t mime_type_len;
} builtin_mime_types[] = {
	{".html", 5, "text/html",   9},
	{".htm", 4, "text/html",   9},
	{".shtm", 5, "text/html",   9},
	{".shtml", 6, "text/html",   9},
	{".css", 4, "text/css",   8},
	{".js",  3, "application/x-javascript", 24},
	{".ico", 4, "image/x-icon",   12},
	{".gif", 4, "image/gif",   9},
	{".jpg", 4, "image/jpeg",   10},
	{".jpeg", 5, "image/jpeg",   10},
	{".png", 4, "image/png",   9},
	{".svg", 4, "image/svg+xml",  13},
	{".torrent", 8, "application/x-bittorrent", 24},
	{".wav", 4, "audio/x-wav",   11},
	{".mp3", 4, "audio/x-mp3",   11},
	{".mid", 4, "audio/mid",   9},
	{".m3u", 4, "audio/x-mpegurl",  15},
	{".ram", 4, "audio/x-pn-realaudio",  20},
	{".xml", 4, "text/xml",   8},
	{".xslt", 5, "application/xml",  15},
	{".ra",  3, "audio/x-pn-realaudio",  20},
	{".doc", 4, "application/msword",  19},
	{".exe", 4, "application/octet-stream", 24},
	{".zip", 4, "application/x-zip-compressed", 28},
	{".xls", 4, "application/excel",  17},
	{".tgz", 4, "application/x-tar-gz",  20},
	{".tar", 4, "application/x-tar",  17},
	{".gz",  3, "application/x-gunzip",  20},
	{".arj", 4, "application/x-arj-compressed", 28},
	{".rar", 4, "application/x-arj-compressed", 28},
	{".rtf", 4, "application/rtf",  15},
	{".pdf", 4, "application/pdf",  15},
	{".swf", 4, "application/x-shockwave-flash",29},
	{".mpg", 4, "video/mpeg",   10},
	{".mpeg", 5, "video/mpeg",   10},
	{".asf", 4, "video/x-ms-asf",  14},
	{".avi", 4, "video/x-msvideo",  15},
	{".bmp", 4, "image/bmp",   9},
	{NULL,  0, NULL,    0}
};

// Look at the "path" extension and figure what mime type it has.
// Store mime type in the vector.
static void get_mime_type(struct mg_context *ctx, const char *path,
struct vec *vec) {
	struct vec ext_vec, mime_vec;
	const char *list, *ext;
	size_t i, path_len;

	path_len = strlen(path);

	// Scan user-defined mime types first, in case user wants to
	// override default mime types.
	list = ctx->config[EXTRA_MIME_TYPES];
	while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
		// ext now points to the path suffix
		ext = path + path_len - ext_vec.len;
		if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
			*vec = mime_vec;
			return;
		}
	}

	// Now scan built-in mime types
	for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
		ext = path + (path_len - builtin_mime_types[i].ext_len);
		if (path_len > builtin_mime_types[i].ext_len &&
			mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
				vec->ptr = builtin_mime_types[i].mime_type;
				vec->len = builtin_mime_types[i].mime_type_len;
				return;
		}
	}

	// Nothing found. Fall back to "text/plain"
	vec->ptr = "text/plain";
	vec->len = 10;
}

#ifndef HAVE_MD5
typedef struct MD5Context {
	uint32_t buf[4];
	uint32_t bits[2];
	unsigned char in[64];
} MD5_CTX;

#if __BYTE_ORDER == 1234
#define byteReverse(buf, len) // Do nothing
#else
static void byteReverse(unsigned char *buf, unsigned longs) {
	uint32_t t;
	do {
		t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
			((unsigned) buf[1] << 8 | buf[0]);
		*(uint32_t *) buf = t;
		buf += 4;
	} while (--longs);
}
#endif

#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))

#define MD5STEP(f, w, x, y, z, data, s) \
	( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )

// Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
// initialization constants.
static void MD5Init(MD5_CTX *ctx) {
	ctx->buf[0] = 0x67452301;
	ctx->buf[1] = 0xefcdab89;
	ctx->buf[2] = 0x98badcfe;
	ctx->buf[3] = 0x10325476;

	ctx->bits[0] = 0;
	ctx->bits[1] = 0;
}

static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
	register uint32_t a, b, c, d;

	a = buf[0];
	b = buf[1];
	c = buf[2];
	d = buf[3];

	MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
	MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
	MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
	MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
	MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
	MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
	MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
	MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
	MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
	MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
	MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
	MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
	MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
	MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
	MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
	MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);

	MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
	MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
	MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
	MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
	MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
	MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
	MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
	MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
	MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
	MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
	MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
	MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
	MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
	MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
	MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
	MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

	MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
	MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
	MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
	MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
	MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
	MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
	MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
	MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
	MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
	MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
	MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
	MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
	MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
	MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
	MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
	MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);

	MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
	MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
	MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
	MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
	MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
	MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
	MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
	MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
	MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
	MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
	MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
	MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
	MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
	MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
	MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
	MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);

	buf[0] += a;
	buf[1] += b;
	buf[2] += c;
	buf[3] += d;
}

static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
	uint32_t t;

	t = ctx->bits[0];
	if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
		ctx->bits[1]++;
	ctx->bits[1] += len >> 29;

	t = (t >> 3) & 0x3f;

	if (t) {
		unsigned char *p = (unsigned char *) ctx->in + t;

		t = 64 - t;
		if (len < t) {
			memcpy(p, buf, len);
			return;
		}
		memcpy(p, buf, t);
		byteReverse(ctx->in, 16);
		MD5Transform(ctx->buf, (uint32_t *) ctx->in);
		buf += t;
		len -= t;
	}

	while (len >= 64) {
		memcpy(ctx->in, buf, 64);
		byteReverse(ctx->in, 16);
		MD5Transform(ctx->buf, (uint32_t *) ctx->in);
		buf += 64;
		len -= 64;
	}

	memcpy(ctx->in, buf, len);
}

static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
	unsigned count;
	unsigned char *p;

	count = (ctx->bits[0] >> 3) & 0x3F;

	p = ctx->in + count;
	*p++ = 0x80;
	count = 64 - 1 - count;
	if (count < 8) {
		memset(p, 0, count);
		byteReverse(ctx->in, 16);
		MD5Transform(ctx->buf, (uint32_t *) ctx->in);
		memset(ctx->in, 0, 56);
	} else {
		memset(p, 0, count - 8);
	}
	byteReverse(ctx->in, 14);

	((uint32_t *) ctx->in)[14] = ctx->bits[0];
	((uint32_t *) ctx->in)[15] = ctx->bits[1];

	MD5Transform(ctx->buf, (uint32_t *) ctx->in);
	byteReverse((unsigned char *) ctx->buf, 4);
	memcpy(digest, ctx->buf, 16);
	memset((char *) ctx, 0, sizeof(ctx));
}
#endif // !HAVE_MD5

// Stringify binary data. Output buffer must be twice as big as input,
// because each byte takes 2 bytes in string representation
static void bin2str(char *to, const unsigned char *p, size_t len) {
	static const char *hex = "0123456789abcdef";

	for (; len--; p++) {
		*to++ = hex[p[0] >> 4];
		*to++ = hex[p[0] & 0x0f];
	}
	*to = '\0';
}

// Return stringified MD5 hash for list of vectors. Buffer must be 33 bytes.
void mg_md5(char *buf, ...) {
	unsigned char hash[16];
	const char *p;
	va_list ap;
	MD5_CTX ctx;

	MD5Init(&ctx);

	va_start(ap, buf);
	while ((p = va_arg(ap, const char *)) != NULL) {
		MD5Update(&ctx, (unsigned char *) p, (int) strlen(p));
	}
	va_end(ap);

	MD5Final(hash, &ctx);
	bin2str(buf, hash, sizeof(hash));
}

// Check the user's password, return 1 if OK
static int check_password(const char *method, const char *ha1, const char *uri,
						  const char *nonce, const char *nc, const char *cnonce,
						  const char *qop, const char *response) {
							  char ha2[32 + 1], expected_response[32 + 1];

							  // NOTE(lsm): due to a bug in MSIE, we do not compare the URI
							  // TODO(lsm): check for authentication timeout
							  if (// strcmp(dig->uri, c->ouri) != 0 ||
								  strlen(response) != 32
								  // || now - strtoul(dig->nonce, NULL, 10) > 3600
								  ) {
									  return 0;
							  }

							  mg_md5(ha2, method, ":", uri, NULL);
							  mg_md5(expected_response, ha1, ":", nonce, ":", nc,
								  ":", cnonce, ":", qop, ":", ha2, NULL);

							  return mg_strcasecmp(response, expected_response) == 0;
}

// Use the global passwords file, if specified by auth_gpass option,
// or search for .htpasswd in the requested directory.
static FILE *open_auth_file(struct mg_connection *conn, const char *path) {
	struct mg_context *ctx = conn->ctx;
	char name[PATH_MAX];
	const char *p, *e;
	struct mgstat st;
	FILE *fp;

	if (ctx->config[GLOBAL_PASSWORDS_FILE] != NULL) {
		// Use global passwords file
		fp =  mg_fopen(ctx->config[GLOBAL_PASSWORDS_FILE], "r");
		if (fp == NULL)
			cry(fc(ctx), "fopen(%s): %s",
			ctx->config[GLOBAL_PASSWORDS_FILE], strerror(ERRNO));
	} else if (!mg_stat(path, &st) && st.is_directory) {
		(void) mg_snprintf(conn, name, sizeof(name), "%s%c%s",
			path, DIRSEP, PASSWORDS_FILE_NAME);
		fp = mg_fopen(name, "r");
	} else {
		// Try to find .htpasswd in requested directory.
		for (p = path, e = p + strlen(p) - 1; e > p; e--)
			if (IS_DIRSEP_CHAR(*e))
				break;
		(void) mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
			(int) (e - p), p, DIRSEP, PASSWORDS_FILE_NAME);
		fp = mg_fopen(name, "r");
	}

	return fp;
}

// Parsed Authorization header
struct ah {
	char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
};

static int parse_auth_header(struct mg_connection *conn, char *buf,
							 size_t buf_size, struct ah *ah) {
								 char *name, *value, *s;
								 const char *auth_header;

								 if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
									 mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
										 return 0;
								 }

								 // Make modifiable copy of the auth header
								 (void) mg_strlcpy(buf, auth_header + 7, buf_size);

								 s = buf;
								 (void) memset(ah, 0, sizeof(*ah));

								 // Gobble initial spaces
								 while (isspace(* (unsigned char *) s)) {
									 s++;
								 }

								 // Parse authorization header
								 for (;;) {
									 name = skip(&s, "=");
									 value = skip(&s, " ");

									 // Handle commas: Digest username="a", realm="b", ...
									 if (value[strlen(value) - 1] == ',') {
										 value[strlen(value) - 1] = '\0';
									 }

									 // Trim double quotes around values
									 if (*value == '"') {
										 value++;
										 value[strlen(value) - 1] = '\0';
									 } else if (*value == '\0') {
										 break;
									 }

									 if (!strcmp(name, "username")) {
										 ah->user = value;
									 } else if (!strcmp(name, "cnonce")) {
										 ah->cnonce = value;
									 } else if (!strcmp(name, "response")) {
										 ah->response = value;
									 } else if (!strcmp(name, "uri")) {
										 ah->uri = value;
									 } else if (!strcmp(name, "qop")) {
										 ah->qop = value;
									 } else if (!strcmp(name, "nc")) {
										 ah->nc = value;
									 } else if (!strcmp(name, "nonce")) {
										 ah->nonce = value;
									 }
								 }

								 // CGI needs it as REMOTE_USER
								 if (ah->user != NULL) {
									 conn->request_info.remote_user = mg_strdup(ah->user);
								 }

								 return 1;
}

// Authorize against the opened passwords file. Return 1 if authorized.
static int authorize(struct mg_connection *conn, FILE *fp) {
	struct ah ah;
	char line[256], f_user[256], ha1[256], f_domain[256], buf[BUFSIZ];

	if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
		return 0;
	}

	// Loop over passwords file
	while (fgets(line, sizeof(line), fp) != NULL) {
		if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
			continue;
		}

		if (!strcmp(ah.user, f_user) &&
			!strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
			return check_password(
			conn->request_info.request_method,
			ha1, ah.uri, ah.nonce, ah.nc, ah.cnonce, ah.qop,
			ah.response);
	}

	return 0;
}

// Return 1 if request is authorised, 0 otherwise.
static int check_authorization(struct mg_connection *conn, const char *path) {
	FILE *fp;
	char fname[PATH_MAX];
	struct vec uri_vec, filename_vec;
	const char *list;
	int authorized;

	fp = NULL;
	authorized = 1;

	list = conn->ctx->config[PROTECT_URI];
	while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
		if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
			(void) mg_snprintf(conn, fname, sizeof(fname), "%.*s",
				filename_vec.len, filename_vec.ptr);
			if ((fp = mg_fopen(fname, "r")) == NULL) {
				cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
			}
			break;
		}
	}

	if (fp == NULL) {
		fp = open_auth_file(conn, path);
	}

	if (fp != NULL) {
		authorized = authorize(conn, fp);
		(void) fclose(fp);
	}

	return authorized;
}

static void send_authorization_request(struct mg_connection *conn) {
	conn->request_info.status_code = 401;
	(void) mg_printf(conn,
		"HTTP/1.1 401 Unauthorized\r\n"
		"WWW-Authenticate: Digest qop=\"auth\", "
		"realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
		conn->ctx->config[AUTHENTICATION_DOMAIN],
		(unsigned long) time(NULL));
}

static int is_authorized_for_put(struct mg_connection *conn) {
	FILE *fp;
	int ret = 0;

	fp = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ? NULL :
		mg_fopen(conn->ctx->config[PUT_DELETE_PASSWORDS_FILE], "r");

	if (fp != NULL) {
		ret = authorize(conn, fp);
		(void) fclose(fp);
	}

	return ret;
}

int mg_modify_passwords_file(struct mg_context *ctx, const char *fname,
							 const char *user, const char *pass) {
								 int found;
								 char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
								 const char *domain;
								 FILE *fp, *fp2;

								 found = 0;
								 fp = fp2 = NULL;
								 domain = ctx->config[AUTHENTICATION_DOMAIN];

								 // Regard empty password as no password - remove user record.
								 if (pass[0] == '\0') {
									 pass = NULL;
								 }

								 (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);

								 // Create the file if does not exist
								 if ((fp = mg_fopen(fname, "a+")) != NULL) {
									 (void) fclose(fp);
								 }

								 // Open the given file and temporary file
								 if ((fp = mg_fopen(fname, "r")) == NULL) {
									 cry(fc(ctx), "Cannot open %s: %s", fname, strerror(errno));
									 return 0;
								 } else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) {
									 cry(fc(ctx), "Cannot open %s: %s", tmp, strerror(errno));
									 return 0;
								 }

								 // Copy the stuff to temporary file
								 while (fgets(line, sizeof(line), fp) != NULL) {
									 if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
										 continue;
									 }

									 if (!strcmp(u, user) && !strcmp(d, domain)) {
										 found++;
										 if (pass != NULL) {
											 mg_md5(ha1, user, ":", domain, ":", pass, NULL);
											 fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
										 }
									 } else {
										 (void) fprintf(fp2, "%s", line);
									 }
								 }

								 // If new user, just add it
								 if (!found && pass != NULL) {
									 mg_md5(ha1, user, ":", domain, ":", pass, NULL);
									 (void) fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
								 }

								 // Close files
								 (void) fclose(fp);
								 (void) fclose(fp2);

								 // Put the temp file in place of real file
								 (void) mg_remove(fname);
								 (void) mg_rename(tmp, fname);

								 return 1;
}

struct de {
	struct mg_connection *conn;
	char *file_name;
	struct mgstat st;
};

static void url_encode(const char *src, char *dst, size_t dst_len) {
	static const char *dont_escape = "._-$,;~()";
	static const char *hex = "0123456789abcdef";
	const char *end = dst + dst_len - 1;

	for (; *src != '\0' && dst < end; src++, dst++) {
		if (isalnum(*(unsigned char *) src) ||
			strchr(dont_escape, * (unsigned char *) src) != NULL) {
				*dst = *src;
		} else if (dst + 2 < end) {
			dst[0] = '%';
			dst[1] = hex[(* (unsigned char *) src) >> 4];
			dst[2] = hex[(* (unsigned char *) src) & 0xf];
			dst += 2;
		}
	}

	*dst = '\0';
}

static void print_dir_entry(struct de *de) {
	char size[64], mod[64], href[PATH_MAX];

	if (de->st.is_directory) {
		(void) mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
	} else {
		// We use (signed) cast below because MSVC 6 compiler cannot
		// convert unsigned __int64 to double. Sigh.
		if (de->st.size < 1024) {
			(void) mg_snprintf(de->conn, size, sizeof(size),
				"%lu", (unsigned long) de->st.size);
		} else if (de->st.size < 1024 * 1024) {
			(void) mg_snprintf(de->conn, size, sizeof(size),
				"%.1fk", (double) de->st.size / 1024.0);
		} else if (de->st.size < 1024 * 1024 * 1024) {
			(void) mg_snprintf(de->conn, size, sizeof(size),
				"%.1fM", (double) de->st.size / 1048576);
		} else {
			(void) mg_snprintf(de->conn, size, sizeof(size),
				"%.1fG", (double) de->st.size / 1073741824);
		}
	}
	(void) strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&de->st.mtime));
	url_encode(de->file_name, href, sizeof(href));
	de->conn->num_bytes_sent += mg_printf(de->conn,
		"<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
		"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
		de->conn->request_info.uri, href, de->st.is_directory ? "/" : "",
		de->file_name, de->st.is_directory ? "/" : "", mod, size);
}

// This function is called from send_directory() and used for
// sorting directory entries by size, or name, or modification time.
// On windows, __cdecl specification is needed in case if project is built
// with __stdcall convention. qsort always requires __cdels callback.
static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
	const struct de *a = (struct de *) p1, *b = (struct de *) p2;
	const char *query_string = a->conn->request_info.query_string;
	int cmp_result = 0;

	if (query_string == NULL) {
		query_string = "na";
	}

	if (a->st.is_directory && !b->st.is_directory) {
		return -1;  // Always put directories on top
	} else if (!a->st.is_directory && b->st.is_directory) {
		return 1;   // Always put directories on top
	} else if (*query_string == 'n') {
		cmp_result = strcmp(a->file_name, b->file_name);
	} else if (*query_string == 's') {
		cmp_result = a->st.size == b->st.size ? 0 :
			a->st.size > b->st.size ? 1 : -1;
	} else if (*query_string == 'd') {
		cmp_result = a->st.mtime == b->st.mtime ? 0 :
			a->st.mtime > b->st.mtime ? 1 : -1;
	}

	return query_string[1] == 'd' ? -cmp_result : cmp_result;
}

static void handle_directory_request(struct mg_connection *conn,
									 const char *dir) {
										 struct dirent *dp;
										 DIR *dirp;
										 struct de *entries = NULL;
										 char path[PATH_MAX];
										 int i, sort_direction, num_entries = 0, arr_size = 128;

										 if ((dirp = opendir(dir)) == NULL) {
											 send_http_error(conn, 500, "Cannot open directory",
												 "Error: opendir(%s): %s", path, strerror(ERRNO));
											 return;
										 }

										 (void) mg_printf(conn, "%s",
											 "HTTP/1.1 200 OK\r\n"
											 "Connection: close\r\n"
											 "Content-Type: text/html; charset=utf-8\r\n\r\n");

										 sort_direction = conn->request_info.query_string != NULL &&
											 conn->request_info.query_string[1] == 'd' ? 'a' : 'd';

										 while ((dp = readdir(dirp)) != NULL) {

											 // Do not show current dir and passwords file
											 if (!strcmp(dp->d_name, ".") ||
												 !strcmp(dp->d_name, "..") ||
												 !strcmp(dp->d_name, PASSWORDS_FILE_NAME))
												 continue;

											 if (entries == NULL || num_entries >= arr_size) {
												 arr_size *= 2;
												 entries = (struct de *) realloc(entries,
													 arr_size * sizeof(entries[0]));
											 }

											 if (entries == NULL) {
												 send_http_error(conn, 500, "Cannot open directory",
													 "%s", "Error: cannot allocate memory");
												 return;
											 }

											 mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, DIRSEP, dp->d_name);

											 // If we don't memset stat structure to zero, mtime will have
											 // garbage and strftime() will segfault later on in
											 // print_dir_entry(). memset is required only if mg_stat()
											 // fails. For more details, see
											 // http://code.google.com/p/mongoose/issues/detail?id=79
											 if (mg_stat(path, &entries[num_entries].st) != 0) {
												 memset(&entries[num_entries].st, 0, sizeof(entries[num_entries].st));
											 }

											 entries[num_entries].conn = conn;
											 entries[num_entries].file_name = mg_strdup(dp->d_name);
											 num_entries++;
										 }
										 (void) closedir(dirp);

										 conn->num_bytes_sent += mg_printf(conn,
											 "<html><head><title>Index of %s</title>"
											 "<style>th {text-align: left;}</style></head>"
											 "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
											 "<tr><th><a href=\"?n%c\">Name</a></th>"
											 "<th><a href=\"?d%c\">Modified</a></th>"
											 "<th><a href=\"?s%c\">Size</a></th></tr>"
											 "<tr><td colspan=\"3\"><hr></td></tr>",
											 conn->request_info.uri, conn->request_info.uri,
											 sort_direction, sort_direction, sort_direction);

										 // Print first entry - link to a parent directory
										 conn->num_bytes_sent += mg_printf(conn,
											 "<tr><td><a href=\"%s%s\">%s</a></td>"
											 "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
											 conn->request_info.uri, "..", "Parent directory", "-", "-");

										 // Sort and print directory entries
										 qsort(entries, num_entries, sizeof(entries[0]), compare_dir_entries);
										 for (i = 0; i < num_entries; i++) {
											 print_dir_entry(&entries[i]);
											 free(entries[i].file_name);
										 }
										 free(entries);

										 conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
										 conn->request_info.status_code = 200;
}

// Send len bytes from the opened file to the client.
static void send_file_data(struct mg_connection *conn, FILE *fp, int64_t len) {
	char buf[BUFSIZ];
	int to_read, num_read, num_written;

	while (len > 0) {
		// Calculate how much to read from the file in the buffer
		to_read = sizeof(buf);
		if ((int64_t) to_read > len)
			to_read = (int) len;

		// Read from file, exit the loop on error
		if ((num_read = (int)fread(buf, 1, to_read, fp)) == 0)
			break;

		// Send read bytes to the client, exit the loop on error
		if ((num_written = mg_write(conn, buf, num_read)) != num_read)
			break;

		// Both read and were successful, adjust counters
		conn->num_bytes_sent += num_written;
		len -= num_written;
	}
}

static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
	return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
}

static void handle_file_request(struct mg_connection *conn, const char *path,
struct mgstat *stp) {
	char date[64], lm[64], etag[64], range[64];
	const char *fmt = "%a, %d %b %Y %H:%M:%S %Z", *msg = "OK", *hdr;
	time_t curtime = time(NULL);
	int64_t cl, r1, r2;
	struct vec mime_vec;
	FILE *fp;
	int n;

	get_mime_type(conn->ctx, path, &mime_vec);
	cl = stp->size;
	conn->request_info.status_code = 200;
	range[0] = '\0';

	if ((fp = mg_fopen(path, "rb")) == NULL) {
		send_http_error(conn, 500, http_500_error,
			"fopen(%s): %s", path, strerror(ERRNO));
		return;
	}
	set_close_on_exec(fileno(fp));

	// If Range: header specified, act accordingly
	r1 = r2 = 0;
	hdr = mg_get_header(conn, "Range");
	if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0) {
		conn->request_info.status_code = 206;
		(void) fseeko(fp, (off_t) r1, SEEK_SET);
		cl = n == 2 ? r2 - r1 + 1: cl - r1;
		(void) mg_snprintf(conn, range, sizeof(range),
			"Content-Range: bytes "
			"%" INT64_FMT "-%"
			INT64_FMT "/%" INT64_FMT "\r\n",
			r1, r1 + cl - 1, stp->size);
		msg = "Partial Content";
	}

	// Prepare Etag, Date, Last-Modified headers
	(void) strftime(date, sizeof(date), fmt, localtime(&curtime));
	(void) strftime(lm, sizeof(lm), fmt, localtime(&stp->mtime));
	(void) mg_snprintf(conn, etag, sizeof(etag), "%lx.%lx",
		(unsigned long) stp->mtime, (unsigned long) stp->size);

	(void) mg_printf(conn,
		"HTTP/1.1 %d %s\r\n"
		"Date: %s\r\n"
		"Last-Modified: %s\r\n"
		"Etag: \"%s\"\r\n"
		"Content-Type: %.*s\r\n"
		"Content-Length: %" INT64_FMT "\r\n"
		"Connection: %s\r\n"
		"Accept-Ranges: bytes\r\n"
		"%s\r\n",
		conn->request_info.status_code, msg, date, lm, etag,
		mime_vec.len, mime_vec.ptr, cl, suggest_connection_header(conn), range);

	if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
		send_file_data(conn, fp, cl);
	}
	(void) fclose(fp);
}

// Parse HTTP headers from the given buffer, advance buffer to the point
// where parsing stopped.
static void parse_http_headers(char **buf, struct mg_request_info *ri) {
	int i;

	for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
		ri->http_headers[i].name = skip(buf, ": ");
		ri->http_headers[i].value = skip(buf, "\r\n");
		if (ri->http_headers[i].name[0] == '\0')
			break;
		ri->num_headers = i + 1;
	}
}

static int is_valid_http_method(const char *method) {
	return !strcmp(method, "GET") || !strcmp(method, "POST") ||
		!strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
		!strcmp(method, "PUT") || !strcmp(method, "DELETE");
}

// Parse HTTP request, fill in mg_request_info structure.
static int parse_http_request(char *buf, struct mg_request_info *ri) {
	int status = 0;

	// RFC says that all initial whitespaces should be ingored
	while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
		buf++;
	}

	ri->request_method = skip(&buf, " ");
	ri->uri = skip(&buf, " ");
	ri->http_version = skip(&buf, "\r\n");

	if (is_valid_http_method(ri->request_method) &&
		strncmp(ri->http_version, "HTTP/", 5) == 0) {
			ri->http_version += 5;   /* Skip "HTTP/" */
			parse_http_headers(&buf, ri);
			status = 1;
	}

	return status;
}

// Keep reading the input (either opened file descriptor fd, or socket sock,
// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
// buffer (which marks the end of HTTP request). Buffer buf may already
// have some data. The length of the data is stored in nread.
// Upon every read operation, increase nread by the number of bytes read.
static int read_request(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int bufsiz,
						int *nread) {
							int n, request_len;

							request_len = 0;
							while (*nread < bufsiz && request_len == 0) {
								n = pull(fp, sock, ssl, buf + *nread, bufsiz - *nread);
								if (n <= 0) {
									break;
								} else {
									*nread += n;
									request_len = get_request_len(buf, *nread);
								}
							}

							return request_len;
}

// For given directory path, substitute it to valid index file.
// Return 0 if index file has been found, -1 if not found.
// If the file is found, it's stats is returned in stp.
static int substitute_index_file(struct mg_connection *conn, char *path,
								 size_t path_len, struct mgstat *stp) {
									 const char *list = conn->ctx->config[INDEX_FILES];
									 struct mgstat st;
									 struct vec filename_vec;
									 size_t n = strlen(path);
									 int found = 0;

									 // The 'path' given to us points to the directory. Remove all trailing
									 // directory separator characters from the end of the path, and
									 // then append single directory separator character.
									 while (n > 0 && IS_DIRSEP_CHAR(path[n - 1])) {
										 n--;
									 }
									 path[n] = DIRSEP;

									 // Traverse index files list. For each entry, append it to the given
									 // path and see if the file exists. If it exists, break the loop
									 while ((list = next_option(list, &filename_vec, NULL)) != NULL) {

										 // Ignore too long entries that may overflow path buffer
										 if (filename_vec.len > path_len - n)
											 continue;

										 // Prepare full path to the index file
										 (void) mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);

										 // Does it exist?
										 if (mg_stat(path, &st) == 0) {
											 // Yes it does, break the loop
											 *stp = st;
											 found = 1;
											 break;
										 }
									 }

									 // If no index file exists, restore directory path
									 if (!found) {
										 path[n] = '\0';
									 }

									 return found;
}

// Return True if we should reply 304 Not Modified.
static int is_not_modified(const struct mg_connection *conn,
						   const struct mgstat *stp) {
							   const char *ims = mg_get_header(conn, "If-Modified-Since");
							   return ims != NULL && stp->mtime <= parse_date_string(ims);
}

static int forward_body_data(struct mg_connection *conn, FILE *fp,
							 SOCKET sock, SSL *ssl) {
								 const char *expect, *buffered;
								 char buf[BUFSIZ];
								 int to_read, nread, buffered_len, success = 0;

								 expect = mg_get_header(conn, "Expect");
								 assert(fp != NULL);

								 if (conn->content_len == -1) {
									 send_http_error(conn, 411, "Length Required", "");
								 } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
									 send_http_error(conn, 417, "Expectation Failed", "");
								 } else {
									 if (expect != NULL) {
										 (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
									 }

									 buffered = conn->buf + conn->request_len;
									 buffered_len = conn->data_len - conn->request_len;
									 assert(buffered_len >= 0);
									 assert(conn->consumed_content == 0);

									 if (buffered_len > 0) {
										 if ((int64_t) buffered_len > conn->content_len) {
											 buffered_len = (int) conn->content_len;
										 }
										 push(fp, sock, ssl, buffered, (int64_t) buffered_len);
										 conn->consumed_content += buffered_len;
									 }

									 while (conn->consumed_content < conn->content_len) {
										 to_read = sizeof(buf);
										 if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
											 to_read = (int) (conn->content_len - conn->consumed_content);
										 }
										 nread = pull(NULL, conn->client.sock, conn->ssl, buf, to_read);
										 if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
											 break;
										 }
										 conn->consumed_content += nread;
									 }

									 if (conn->consumed_content == conn->content_len) {
										 success = 1;
									 }

									 // Each error code path in this function must send an error
									 if (!success) {
										 send_http_error(conn, 577, http_500_error, "");
									 }
								 }

								 return success;
}

#if !defined(NO_CGI)
// This structure helps to create an environment for the spawned CGI program.
// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
// last element must be NULL.
// However, on Windows there is a requirement that all these VARIABLE=VALUE\0
// strings must reside in a contiguous buffer. The end of the buffer is
// marked by two '\0' characters.
// We satisfy both worlds: we create an envp array (which is vars), all
// entries are actually pointers inside buf.
struct cgi_env_block {
	struct mg_connection *conn;
	char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
	int len; // Space taken
	char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
	int nvars; // Number of variables
};

// Append VARIABLE=VALUE\0 string to the buffer, and add a respective
// pointer into the vars array.
static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
	int n, space;
	char *added;
	va_list ap;

	// Calculate how much space is left in the buffer
	space = sizeof(block->buf) - block->len - 2;
	assert(space >= 0);

	// Make a pointer to the free space int the buffer
	added = block->buf + block->len;

	// Copy VARIABLE=VALUE\0 string into the free space
	va_start(ap, fmt);
	n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
	va_end(ap);

	// Make sure we do not overflow buffer and the envp array
	if (n > 0 && n < space &&
		block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
			// Append a pointer to the added string into the envp array
			block->vars[block->nvars++] = block->buf + block->len;
			// Bump up used length counter. Include \0 terminator
			block->len += n + 1;
	}

	return added;
}

static void prepare_cgi_environment(struct mg_connection *conn,
									const char *prog,
struct cgi_env_block *blk) {
	const char *s, *slash;
	struct vec var_vec, root;
	char *p;
	int  i;

	blk->len = blk->nvars = 0;
	blk->conn = conn;

	get_document_root(conn, &root);

	addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
	addenv(blk, "SERVER_ROOT=%.*s", root.len, root.ptr);
	addenv(blk, "DOCUMENT_ROOT=%.*s", root.len, root.ptr);

	// Prepare the environment block
	addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
	addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
	addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
	addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.u.sin.sin_port));
	addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
	addenv(blk, "REMOTE_ADDR=%s",
		inet_ntoa(conn->client.rsa.u.sin.sin_addr));
	addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
	addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);

	// SCRIPT_NAME
	assert(conn->request_info.uri[0] == '/');
	slash = strrchr(conn->request_info.uri, '/');
	if ((s = strrchr(prog, '/')) == NULL)
		s = prog;
	addenv(blk, "SCRIPT_NAME=%.*s%s", slash - conn->request_info.uri,
		conn->request_info.uri, s);

	addenv(blk, "SCRIPT_FILENAME=%s", prog);
	addenv(blk, "PATH_TRANSLATED=%s", prog);
	addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");

	if ((s = mg_get_header(conn, "Content-Type")) != NULL)
		addenv(blk, "CONTENT_TYPE=%s", s);

	if (conn->request_info.query_string != NULL)
		addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);

	if ((s = mg_get_header(conn, "Content-Length")) != NULL)
		addenv(blk, "CONTENT_LENGTH=%s", s);

	if ((s = getenv("PATH")) != NULL)
		addenv(blk, "PATH=%s", s);

#if defined(_WIN32)
	if ((s = getenv("COMSPEC")) != NULL)
		addenv(blk, "COMSPEC=%s", s);
	if ((s = getenv("SYSTEMROOT")) != NULL)
		addenv(blk, "SYSTEMROOT=%s", s);
#else
	if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
		addenv(blk, "LD_LIBRARY_PATH=%s", s);
#endif /* _WIN32 */

	if ((s = getenv("PERLLIB")) != NULL)
		addenv(blk, "PERLLIB=%s", s);

	if (conn->request_info.remote_user != NULL) {
		addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
		addenv(blk, "%s", "AUTH_TYPE=Digest");
	}

	// Add all headers as HTTP_* variables
	for (i = 0; i < conn->request_info.num_headers; i++) {
		p = addenv(blk, "HTTP_%s=%s",
			conn->request_info.http_headers[i].name,
			conn->request_info.http_headers[i].value);

		// Convert variable name into uppercase, and change - to _
		for (; *p != '=' && *p != '\0'; p++) {
			if (*p == '-')
				*p = '_';
			*p = (char) toupper(* (unsigned char *) p);
		}
	}

	// Add user-specified variables
	s = conn->ctx->config[CGI_ENVIRONMENT];
	while ((s = next_option(s, &var_vec, NULL)) != NULL) {
		addenv(blk, "%.*s", var_vec.len, var_vec.ptr);
	}

	blk->vars[blk->nvars++] = NULL;
	blk->buf[blk->len++] = '\0';

	assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
	assert(blk->len > 0);
	assert(blk->len < (int) sizeof(blk->buf));
}

static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
	int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
	const char *status;
	char buf[BUFSIZ], *pbuf, dir[PATH_MAX], *p;
	struct mg_request_info ri;
	struct cgi_env_block blk;
	FILE *in, *out;
	pid_t pid;

	prepare_cgi_environment(conn, prog, &blk);

	// CGI must be executed in its own directory. 'dir' must point to the
	// directory containing executable program, 'p' must point to the
	// executable program name relative to 'dir'.
	(void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
	if ((p = strrchr(dir, DIRSEP)) != NULL) {
		*p++ = '\0';
	} else {
		dir[0] = '.', dir[1] = '\0';
		p = (char *) prog;
	}

	pid = (pid_t) -1;
	fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
	in = out = NULL;

	if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
		send_http_error(conn, 500, http_500_error,
			"Cannot create CGI pipe: %s", strerror(ERRNO));
		goto done;
	} else if ((pid = spawn_process(conn, p, blk.buf, blk.vars,
		fd_stdin[0], fd_stdout[1], dir)) == (pid_t) -1) {
			goto done;
	} else if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
		(out = fdopen(fd_stdout[0], "rb")) == NULL) {
			send_http_error(conn, 500, http_500_error,
				"fopen: %s", strerror(ERRNO));
			goto done;
	}

	setbuf(in, NULL);
	setbuf(out, NULL);

	// spawn_process() must close those!
	// If we don't mark them as closed, close() attempt before
	// return from this function throws an exception on Windows.
	// Windows does not like when closed descriptor is closed again.
	fd_stdin[0] = fd_stdout[1] = -1;

	// Send POST data to the CGI process if needed
	if (!strcmp(conn->request_info.request_method, "POST") &&
		!forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
			goto done;
	}

	// Now read CGI reply into a buffer. We need to set correct
	// status code, thus we need to see all HTTP headers first.
	// Do not send anything back to client, until we buffer in all
	// HTTP headers.
	data_len = 0;
	headers_len = read_request(out, INVALID_SOCKET, NULL,
		buf, sizeof(buf), &data_len);
	if (headers_len <= 0) {
		send_http_error(conn, 500, http_500_error,
			"CGI program sent malformed HTTP headers: [%.*s]",
			data_len, buf);
		goto done;
	}
	pbuf = buf;
	buf[headers_len - 1] = '\0';
	parse_http_headers(&pbuf, &ri);

	// Make up and send the status line
	status = get_header(&ri, "Status");
	conn->request_info.status_code = status == NULL ? 200 : atoi(status);
	(void) mg_printf(conn, "HTTP/1.1 %d OK\r\n", conn->request_info.status_code);

	// Send headers
	for (i = 0; i < ri.num_headers; i++) {
		mg_printf(conn, "%s: %s\r\n",
			ri.http_headers[i].name, ri.http_headers[i].value);
	}
	(void) mg_write(conn, "\r\n", 2);

	// Send chunk of data that may be read after the headers
	conn->num_bytes_sent += mg_write(conn, buf + headers_len,
		data_len - headers_len);

	// Read the rest of CGI output and send to the client
	send_file_data(conn, out, INT64_MAX);

done:
	if (pid != (pid_t) -1) {
		kill(pid, SIGKILL);
#if !defined(_WIN32)
		do {} while (waitpid(-1, &i, WNOHANG) > 0);
#endif
	}
	if (fd_stdin[0] != -1) {
		(void) close(fd_stdin[0]);
	}
	if (fd_stdout[1] != -1) {
		(void) close(fd_stdout[1]);
	}

	if (in != NULL) {
		(void) fclose(in);
	} else if (fd_stdin[1] != -1) {
		(void) close(fd_stdin[1]);
	}

	if (out != NULL) {
		(void) fclose(out);
	} else if (fd_stdout[0] != -1) {
		(void) close(fd_stdout[0]);
	}
}
#endif // !NO_CGI

// For a given PUT path, create all intermediate subdirectories
// for given path. Return 0 if the path itself is a directory,
// or -1 on error, 1 if OK.
static int put_dir(const char *path) {
	char buf[PATH_MAX];
	const char *s, *p;
	struct mgstat st;
	size_t len;

	for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
		len = p - path;
		assert(len < sizeof(buf));
		(void) memcpy(buf, path, len);
		buf[len] = '\0';

		// Try to create intermediate directory
		if (mg_stat(buf, &st) == -1 && mg_mkdir(buf, 0755) != 0) {
			return -1;
		}

		// Is path itself a directory?
		if (p[1] == '\0') {
			return 0;
		}
	}

	return 1;
}

static void put_file(struct mg_connection *conn, const char *path) {
	struct mgstat st;
	const char *range;
	int64_t r1, r2;
	FILE *fp;
	int rc;

	conn->request_info.status_code = mg_stat(path, &st) == 0 ? 200 : 201;

	if ((rc = put_dir(path)) == 0) {
		mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->request_info.status_code);
	} else if (rc == -1) {
		send_http_error(conn, 500, http_500_error,
			"put_dir(%s): %s", path, strerror(ERRNO));
	} else if ((fp = mg_fopen(path, "wb+")) == NULL) {
		send_http_error(conn, 500, http_500_error,
			"fopen(%s): %s", path, strerror(ERRNO));
	} else {
		set_close_on_exec(fileno(fp));
		range = mg_get_header(conn, "Content-Range");
		r1 = r2 = 0;
		if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
			conn->request_info.status_code = 206;
			// TODO(lsm): handle seek error
			(void) fseeko(fp, (off_t) r1, SEEK_SET);
		}
		if (forward_body_data(conn, fp, INVALID_SOCKET, NULL))
			(void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n",
			conn->request_info.status_code);
		(void) fclose(fp);
	}
}

static void send_ssi_file(struct mg_connection *, const char *, FILE *, int);

static void do_ssi_include(struct mg_connection *conn, const char *ssi,
						   char *tag, int include_level) {
							   char file_name[BUFSIZ], path[PATH_MAX], *p;
							   struct vec root;
							   int is_ssi;
							   FILE *fp;

							   get_document_root(conn, &root);

							   // sscanf() is safe here, since send_ssi_file() also uses buffer
							   // of size BUFSIZ to get the tag. So strlen(tag) is always < BUFSIZ.
							   if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
								   // File name is relative to the webserver root
								   (void) mg_snprintf(conn, path, sizeof(path), "%.*s%c%s",
									   root.len, root.ptr, DIRSEP, file_name);
							   } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
								   // File name is relative to the webserver working directory
								   // or it is absolute system path
								   (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
							   } else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
								   // File name is relative to the currect document
								   (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
								   if ((p = strrchr(path, DIRSEP)) != NULL) {
									   p[1] = '\0';
								   }
								   (void) mg_snprintf(conn, path + strlen(path),
									   sizeof(path) - strlen(path), "%s", file_name);
							   } else {
								   cry(conn, "Bad SSI #include: [%s]", tag);
								   return;
							   }

							   if ((fp = mg_fopen(path, "rb")) == NULL) {
								   cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
									   tag, path, strerror(ERRNO));
							   } else {
								   set_close_on_exec(fileno(fp));
								   is_ssi = match_extension(path, conn->ctx->config[SSI_EXTENSIONS]);
								   if (is_ssi) {
									   send_ssi_file(conn, path, fp, include_level + 1);
								   } else {
									   send_file_data(conn, fp, INT64_MAX);
								   }
								   (void) fclose(fp);
							   }
}

static void do_ssi_exec(struct mg_connection *conn, char *tag) {
	char cmd[BUFSIZ];
	FILE *fp;

	if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
		cry(conn, "Bad SSI #exec: [%s]", tag);
	} else if ((fp = popen(cmd, "r")) == NULL) {
		cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
	} else {
		send_file_data(conn, fp, INT64_MAX);
		(void) pclose(fp);
	}
}

static void send_ssi_file(struct mg_connection *conn, const char *path,
						  FILE *fp, int include_level) {
							  char buf[BUFSIZ];
							  int ch, len, in_ssi_tag;

							  if (include_level > 10) {
								  cry(conn, "SSI #include level is too deep (%s)", path);
								  return;
							  }

							  in_ssi_tag = 0;
							  len = 0;

							  while ((ch = fgetc(fp)) != EOF) {
								  if (in_ssi_tag && ch == '>') {
									  in_ssi_tag = 0;
									  buf[len++] = (char) ch;
									  buf[len] = '\0';
									  assert(len <= (int) sizeof(buf));
									  if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
										  // Not an SSI tag, pass it
										  (void) mg_write(conn, buf, len);
									  } else {
										  if (!memcmp(buf + 5, "include", 7)) {
											  do_ssi_include(conn, path, buf + 12, include_level);
										  } else if (!memcmp(buf + 5, "exec", 4)) {
											  do_ssi_exec(conn, buf + 9);
										  } else {
											  cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
										  }
									  }
									  len = 0;
								  } else if (in_ssi_tag) {
									  if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
										  // Not an SSI tag
										  in_ssi_tag = 0;
									  } else if (len == (int) sizeof(buf) - 2) {
										  cry(conn, "%s: SSI tag is too large", path);
										  len = 0;
									  }
									  buf[len++] = ch & 0xff;
								  } else if (ch == '<') {
									  in_ssi_tag = 1;
									  if (len > 0) {
										  (void) mg_write(conn, buf, len);
									  }
									  len = 0;
									  buf[len++] = ch & 0xff;
								  } else {
									  buf[len++] = ch & 0xff;
									  if (len == (int) sizeof(buf)) {
										  (void) mg_write(conn, buf, len);
										  len = 0;
									  }
								  }
							  }

							  // Send the rest of buffered data
							  if (len > 0) {
								  (void) mg_write(conn, buf, len);
							  }
}

static void handle_ssi_file_request(struct mg_connection *conn,
									const char *path) {
										FILE *fp;

										if ((fp = mg_fopen(path, "rb")) == NULL) {
											send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
												strerror(ERRNO));
										} else {
											set_close_on_exec(fileno(fp));
											mg_printf(conn, "HTTP/1.1 200 OK\r\n"
												"Content-Type: text/html\r\nConnection: %s\r\n\r\n",
												suggest_connection_header(conn));
											send_ssi_file(conn, path, fp, 0);
											(void) fclose(fp);
										}
}

// This is the heart of the Mongoose's logic.
// This function is called when the request is read, parsed and validated,
// and Mongoose must decide what action to take: serve a file, or
// a directory, or call embedded function, etcetera.
static void handle_request(struct mg_connection *conn) {
	struct mg_request_info *ri = &conn->request_info;
	char path[PATH_MAX];
	int uri_len;
	struct mgstat st;

	if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
		* conn->request_info.query_string++ = '\0';
	}
	uri_len = (int)strlen(ri->uri);
	(void) url_decode(ri->uri, uri_len, ri->uri, uri_len + 1, 0);
	remove_double_dots_and_double_slashes(ri->uri);
	convert_uri_to_file_name(conn, ri->uri, path, sizeof(path));

	DEBUG_TRACE(("%s", ri->uri));
	if (call_user(conn, MG_NEW_REQUEST) != NULL) {
		// Do nothing, callback has served the request
	} else if (!check_authorization(conn, path)) {
		send_authorization_request(conn);
	} else if (strstr(path, PASSWORDS_FILE_NAME)) {
		// Do not allow to view passwords files
		send_http_error(conn, 403, "Forbidden", "Access Forbidden");
	} else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
		send_http_error(conn, 404, "Not Found", "Not Found");
	} else if ((!strcmp(ri->request_method, "PUT") ||
		!strcmp(ri->request_method, "DELETE")) &&
		(conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ||
		!is_authorized_for_put(conn))) {
			send_authorization_request(conn);
	} else if (!strcmp(ri->request_method, "PUT")) {
		put_file(conn, path);
	} else if (!strcmp(ri->request_method, "DELETE")) {
		if (mg_remove(path) == 0) {
			send_http_error(conn, 200, "OK", "");
		} else {
			send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
				strerror(ERRNO));
		}
	} else if (mg_stat(path, &st) != 0) {
		send_http_error(conn, 404, "Not Found", "%s", "File not found");
	} else if (st.is_directory && ri->uri[uri_len - 1] != '/') {
		(void) mg_printf(conn,
			"HTTP/1.1 301 Moved Permanently\r\n"
			"Location: %s/\r\n\r\n", ri->uri);
	} else if (st.is_directory &&
		!substitute_index_file(conn, path, sizeof(path), &st)) {
			if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
				handle_directory_request(conn, path);
			} else {
				send_http_error(conn, 403, "Directory Listing Denied",
					"Directory listing denied");
			}
	} else if (match_extension(path, conn->ctx->config[CGI_EXTENSIONS])) {
		if (strcmp(ri->request_method, "POST") &&
			strcmp(ri->request_method, "GET")) {
				send_http_error(conn, 501, "Not Implemented",
					"Method %s is not implemented", ri->request_method);
		} else {
			handle_cgi_request(conn, path);
		}
	} else if (match_extension(path, conn->ctx->config[SSI_EXTENSIONS])) {
		handle_ssi_file_request(conn, path);
	} else if (is_not_modified(conn, &st)) {
		send_http_error(conn, 304, "Not Modified", "");
	} else {
		handle_file_request(conn, path, &st);
	}
}

static void close_all_listening_sockets(struct mg_context *ctx) {
	struct socket *sp, *tmp;
	for (sp = ctx->listening_sockets; sp != NULL; sp = tmp) {
		tmp = sp->next;
		(void) closesocket(sp->sock);
		free(sp);
	}
}

// Valid listening port specification is: [ip_address:]port[s|p]
// Examples: 80, 443s, 127.0.0.1:3128p, 1.2.3.4:8080sp
static int parse_port_string(const struct vec *vec, struct socket *so) {
	struct usa *usa = &so->lsa;
	int a, b, c, d, port, len;

	// MacOS needs that. If we do not zero it, subsequent bind() will fail.
	memset(so, 0, sizeof(*so));

	if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) {
		// IP address to bind to is specified
		usa->u.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
	} else if (sscanf(vec->ptr, "%d%n", &port, &len) == 1) {
		// Only port number is specified. Bind to all addresses
		usa->u.sin.sin_addr.s_addr = htonl(INADDR_ANY);
	} else {
		return 0;
	}
	assert(len > 0 && len <= (int) vec->len);

	if (strchr("sp,", vec->ptr[len]) == NULL) {
		return 0;
	}

	so->is_ssl = vec->ptr[len] == 's';
	so->is_proxy = vec->ptr[len] == 'p';
	usa->len = sizeof(usa->u.sin);
	usa->u.sin.sin_family = AF_INET;
	usa->u.sin.sin_port = htons((uint16_t) port);

	return 1;
}

static int set_ports_option(struct mg_context *ctx) {
	const char *list = ctx->config[LISTENING_PORTS];
	int reuseaddr = 1, success = 1;
	SOCKET sock;
	struct vec vec;
	struct socket so, *listener;

	while (success && (list = next_option(list, &vec, NULL)) != NULL) {
		if (!parse_port_string(&vec, &so)) {
			cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
				__func__, vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]");
			success = 0;
		} else if (so.is_ssl && ctx->ssl_ctx == NULL) {
			cry(fc(ctx), "Cannot add SSL socket, is -ssl_cert option set?");
			success = 0;
		} else if ((sock = socket(PF_INET, SOCK_STREAM, 6)) == INVALID_SOCKET ||
#if !defined(_WIN32)
			// On Windows, SO_REUSEADDR is recommended only for
			// broadcast UDP sockets
			setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuseaddr,
			sizeof(reuseaddr)) != 0 ||
#endif // !_WIN32
			bind(sock, &so.lsa.u.sa, so.lsa.len) != 0 ||
			listen(sock, 20) != 0) {
				closesocket(sock);
				cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__,
					vec.len, vec.ptr, strerror(ERRNO));
				success = 0;
		} else if ((listener = (struct socket *)calloc(1, sizeof(*listener))) == NULL) {
			closesocket(sock);
			cry(fc(ctx), "%s: %s", __func__, strerror(ERRNO));
			success = 0;
		} else {
			*listener = so;
			listener->sock = sock;
			set_close_on_exec(listener->sock);
			listener->next = ctx->listening_sockets;
			ctx->listening_sockets = listener;
		}
	}

	if (!success) {
		close_all_listening_sockets(ctx);
	}

	return success;
}

static void log_header(const struct mg_connection *conn, const char *header,
					   FILE *fp) {
						   const char *header_value;

						   if ((header_value = mg_get_header(conn, header)) == NULL) {
							   (void) fprintf(fp, "%s", " -");
						   } else {
							   (void) fprintf(fp, " \"%s\"", header_value);
						   }
}

static void log_access(const struct mg_connection *conn) {
	const struct mg_request_info *ri;
	FILE *fp;
	char date[64];

	fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ?  NULL :
		mg_fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");

	if (fp == NULL)
		return;

	(void) strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
		localtime(&conn->birth_time));

	ri = &conn->request_info;

	flockfile(fp);

	(void) fprintf(fp,
		"%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
		inet_ntoa(conn->client.rsa.u.sin.sin_addr),
		ri->remote_user == NULL ? "-" : ri->remote_user,
		date,
		ri->request_method ? ri->request_method : "-",
		ri->uri ? ri->uri : "-",
		ri->http_version,
		conn->request_info.status_code, conn->num_bytes_sent);
	log_header(conn, "Referer", fp);
	log_header(conn, "User-Agent", fp);
	(void) fputc('\n', fp);
	(void) fflush(fp);

	funlockfile(fp);
	(void) fclose(fp);
}

static int isbyte(int n) {
	return n >= 0 && n <= 255;
}

// Verify given socket address against the ACL.
// Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
static int check_acl(struct mg_context *ctx, const struct usa *usa) {
	int a, b, c, d, n, mask, allowed;
	char flag;
	uint32_t acl_subnet, acl_mask, remote_ip;
	struct vec vec;
	const char *list = ctx->config[ACCESS_CONTROL_LIST];

	if (list == NULL) {
		return 1;
	}

	(void) memcpy(&remote_ip, &usa->u.sin.sin_addr, sizeof(remote_ip));

	// If any ACL is set, deny by default
	allowed = '-';

	while ((list = next_option(list, &vec, NULL)) != NULL) {
		mask = 32;

		if (sscanf(vec.ptr, "%c%d.%d.%d.%d%n", &flag, &a, &b, &c, &d, &n) != 5) {
			cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
			return -1;
		} else if (flag != '+' && flag != '-') {
			cry(fc(ctx), "%s: flag must be + or -: [%s]", __func__, vec.ptr);
			return -1;
		} else if (!isbyte(a)||!isbyte(b)||!isbyte(c)||!isbyte(d)) {
			cry(fc(ctx), "%s: bad ip address: [%s]", __func__, vec.ptr);
			return -1;
		} else if (sscanf(vec.ptr + n, "/%d", &mask) == 0) {
			// Do nothing, no mask specified
		} else if (mask < 0 || mask > 32) {
			cry(fc(ctx), "%s: bad subnet mask: %d [%s]", __func__, n, vec.ptr);
			return -1;
		}

		acl_subnet = (a << 24) | (b << 16) | (c << 8) | d;
		acl_mask = mask ? 0xffffffffU << (32 - mask) : 0;

		if (acl_subnet == (ntohl(remote_ip) & acl_mask)) {
			allowed = flag;
		}
	}

	return allowed == '+';
}

static void add_to_set(SOCKET fd, fd_set *set, int *max_fd) {
	FD_SET(fd, set);
	if (fd > (SOCKET) *max_fd) {
		*max_fd = (int) fd;
	}
}

#if !defined(_WIN32)
static int set_uid_option(struct mg_context *ctx) {
	struct passwd *pw;
	const char *uid = ctx->config[RUN_AS_USER];
	int success = 0;

	if (uid == NULL) {
		success = 1;
	} else {
		if ((pw = getpwnam(uid)) == NULL) {
			cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
		} else if (setgid(pw->pw_gid) == -1) {
			cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
		} else if (setuid(pw->pw_uid) == -1) {
			cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
		} else {
			success = 1;
		}
	}

	return success;
}
#endif // !_WIN32

#if !defined(NO_SSL)
static pthread_mutex_t *ssl_mutexes;

static void ssl_locking_callback(int mode, int mutex_num, const char *file,
								 int line) {
									 line = 0;    // Unused
									 file = NULL; // Unused

									 if (mode & CRYPTO_LOCK) {
										 (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
									 } else {
										 (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
									 }
}

static unsigned long ssl_id_callback(void) {
	return (unsigned long) pthread_self();
}

#if !defined(NO_SSL_DL)
static int load_dll(struct mg_context *ctx, const char *dll_name,
struct ssl_func *sw) {
	union {void *p; void (*fp)(void);} u;
	void  *dll_handle;
	struct ssl_func *fp;

	if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
		cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
		return 0;
	}

	for (fp = sw; fp->name != NULL; fp++) {
#ifdef _WIN32
		// GetProcAddress() returns pointer to function
		u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
#else
		// dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
		// function pointers. We need to use a union to make a cast.
		u.p = dlsym(dll_handle, fp->name);
#endif /* _WIN32 */
		if (u.fp == NULL) {
			cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
			return 0;
		} else {
			fp->ptr = u.fp;
		}
	}

	return 1;
}
#endif // NO_SSL_DL

// Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
static int set_ssl_option(struct mg_context *ctx) {
	SSL_CTX *CTX;
	int i, size;
	const char *pem = ctx->config[SSL_CERTIFICATE];
	const char *chain = ctx->config[SSL_CHAIN_FILE];

	if (pem == NULL) {
		return 1;
	}

#if !defined(NO_SSL_DL)
	if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
		!load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
			return 0;
	}
#endif // NO_SSL_DL

	// Initialize SSL crap
	SSL_library_init();
	SSL_load_error_strings();

	if ((CTX = SSL_CTX_new(SSLv23_server_method())) == NULL) {
		cry(fc(ctx), "SSL_CTX_new error: %s", ssl_error());
	} else if (ctx->user_callback != NULL) {
		ctx->user_callback(MG_INIT_SSL, (struct mg_connection *) CTX, NULL);
	}

	if (CTX != NULL && SSL_CTX_use_certificate_file(CTX, pem,
		SSL_FILETYPE_PEM) == 0) {
			cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
			return 0;
	} else if (CTX != NULL && SSL_CTX_use_PrivateKey_file(CTX, pem,
		SSL_FILETYPE_PEM) == 0) {
			cry(fc(ctx), "%s: cannot open %s: %s", NULL, pem, ssl_error());
			return 0;
	}

	if (CTX != NULL && chain != NULL &&
		SSL_CTX_use_certificate_chain_file(CTX, chain) == 0) {
			cry(fc(ctx), "%s: cannot open %s: %s", NULL, chain, ssl_error());
			return 0;
	}

	// Initialize locking callbacks, needed for thread safety.
	// http://www.openssl.org/support/faq.html#PROG1
	size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
	if ((ssl_mutexes = (pthread_mutex_t *) malloc(size)) == NULL) {
		cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
		return 0;
	}

	for (i = 0; i < CRYPTO_num_locks(); i++) {
		pthread_mutex_init(&ssl_mutexes[i], NULL);
	}

	CRYPTO_set_locking_callback(&ssl_locking_callback);
	CRYPTO_set_id_callback(&ssl_id_callback);

	// Done with everything. Save the context.
	ctx->ssl_ctx = CTX;

	return 1;
}
#endif // !NO_SSL

static int set_gpass_option(struct mg_context *ctx) {
	struct mgstat mgstat;
	const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
	return path == NULL || mg_stat(path, &mgstat) == 0;
}

static int set_acl_option(struct mg_context *ctx) {
	struct usa fake;
	return check_acl(ctx, &fake) != -1;
}

static void reset_per_request_attributes(struct mg_connection *conn) {
	struct mg_request_info *ri = &conn->request_info;

	// Reset request info attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
	if (ri->remote_user != NULL) {
		free((void *) ri->remote_user);
	}
	ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
	ri->num_headers = 0;
	ri->status_code = -1;

	conn->num_bytes_sent = conn->consumed_content = 0;
	conn->content_len = -1;
	conn->request_len = conn->data_len = 0;
}

static void close_socket_gracefully(SOCKET sock) {
	char buf[BUFSIZ];
	int n;

	// Send FIN to the client
	(void) shutdown(sock, SHUT_WR);
	set_non_blocking_mode(sock);

	// Read and discard pending data. If we do not do that and close the
	// socket, the data in the send buffer may be discarded. This
	// behaviour is seen on Windows, when client keeps sending data
	// when server decide to close the connection; then when client
	// does recv() it gets no data back.
	do {
		n = pull(NULL, sock, NULL, buf, sizeof(buf));
	} while (n > 0);

	// Now we know that our FIN is ACK-ed, safe to close
	(void) closesocket(sock);
}

static void close_connection(struct mg_connection *conn) {
	if (conn->ssl) {
		SSL_free(conn->ssl);
		conn->ssl = NULL;
	}

	if (conn->client.sock != INVALID_SOCKET) {
		close_socket_gracefully(conn->client.sock);
	}
}

static void discard_current_request_from_buffer(struct mg_connection *conn) {
	char *buffered;
	int buffered_len, body_len;

	buffered = conn->buf + conn->request_len;
	buffered_len = conn->data_len - conn->request_len;
	assert(buffered_len >= 0);

	if (conn->content_len == -1) {
		body_len = 0;
	} else if (conn->content_len < (int64_t) buffered_len) {
		body_len = (int) conn->content_len;
	} else {
		body_len = buffered_len;
	}

	conn->data_len -= conn->request_len + body_len;
	memmove(conn->buf, conn->buf + conn->request_len + body_len, conn->data_len);
}

static int parse_url(const char *url, char *host, int *port) {
	int len;

	if (url == NULL) {
		return 0;
	};

	if (!strncmp(url, "http://", 7)) {
		url += 7;
	}

	if (sscanf(url, "%1024[^:]:%d/%n", host, port, &len) == 2) {
	} else {
		sscanf(url, "%1024[^/]/%n", host, &len);
		*port = 80;
	}
	DEBUG_TRACE(("Host:%s, port:%d", host, *port));

	return len > 0 && url[len - 1] == '/' ? len - 1 : len;
}

static void handle_proxy_request(struct mg_connection *conn) {
	struct mg_request_info *ri = &conn->request_info;
	char host[1025], buf[BUFSIZ];
	int port, is_ssl, len, i, n;

	DEBUG_TRACE(("URL: %s", ri->uri));
	if (conn->request_info.uri[0] == '/' ||
		(len = parse_url(ri->uri, host, &port)) == 0) {
			return;
	}

	if (conn->peer == NULL) {
		is_ssl = !strcmp(ri->request_method, "CONNECT");
		if ((conn->peer = mg_connect(conn, host, port, is_ssl)) == NULL) {
			return;
		}
		conn->peer->client.is_ssl = is_ssl;
	}

	// Forward client's request to the target
	mg_printf(conn->peer, "%s %s HTTP/%s\r\n", ri->request_method, ri->uri + len,
		ri->http_version);

	// And also all headers. TODO(lsm): anonymize!
	for (i = 0; i < ri->num_headers; i++) {
		mg_printf(conn->peer, "%s: %s\r\n", ri->http_headers[i].name,
			ri->http_headers[i].value);
	}
	// End of headers, final newline
	mg_write(conn->peer, "\r\n", 2);

	// Read and forward body data if any
	if (!strcmp(ri->request_method, "POST")) {
		forward_body_data(conn, NULL, conn->peer->client.sock, conn->peer->ssl);
	}

	// Read data from the target and forward it to the client
	while ((n = pull(NULL, conn->peer->client.sock, conn->peer->ssl,
		buf, sizeof(buf))) > 0) {
			if (mg_write(conn, buf, n) != n) {
				break;
			}
	}

	if (!conn->peer->client.is_ssl) {
		close_connection(conn->peer);
		free(conn->peer);
		conn->peer = NULL;
	}
}

static void process_new_connection(struct mg_connection *conn) {
	struct mg_request_info *ri = &conn->request_info;
	int keep_alive_enabled;
	const char *cl;

	keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");

	do {
		reset_per_request_attributes(conn);

		// If next request is not pipelined, read it in
		if ((conn->request_len = get_request_len(conn->buf, conn->data_len)) == 0) {
			conn->request_len = read_request(NULL, conn->client.sock, conn->ssl,
				conn->buf, conn->buf_size, &conn->data_len);
		}
		assert(conn->data_len >= conn->request_len);
		if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
			send_http_error(conn, 413, "Request Too Large", "");
			return;
		} if (conn->request_len <= 0) {
			return;  // Remote end closed the connection
		}

		// Nul-terminate the request cause parse_http_request() uses sscanf
		conn->buf[conn->request_len - 1] = '\0';
		if (!parse_http_request(conn->buf, ri) ||
			(!conn->client.is_proxy && ri->uri[0] != '/')) {
				// Do not put garbage in the access log, just send it back to the client
				send_http_error(conn, 400, "Bad Request",
					"Cannot parse HTTP request: [%.*s]", conn->data_len, conn->buf);
		} else if (strcmp(ri->http_version, "1.0") &&
			strcmp(ri->http_version, "1.1")) {
				// Request seems valid, but HTTP version is strange
				send_http_error(conn, 505, "HTTP version not supported", "");
				log_access(conn);
		} else {
			// Request is valid, handle it
			cl = get_header(ri, "Content-Length");
			conn->content_len = cl == NULL ? -1 : strtoll(cl, NULL, 10);
			conn->birth_time = time(NULL);
			if (conn->client.is_proxy) {
				handle_proxy_request(conn);
			} else {
				handle_request(conn);
			}
			log_access(conn);
			discard_current_request_from_buffer(conn);
		}
		// conn->peer is not NULL only for SSL-ed proxy connections
	} while (conn->peer || (keep_alive_enabled && should_keep_alive(conn)));
}

// Worker threads take accepted socket from the queue
static int consume_socket(struct mg_context *ctx, struct socket *sp) {
	(void) pthread_mutex_lock(&ctx->mutex);
	DEBUG_TRACE(("going idle"));

	// If the queue is empty, wait. We're idle at this point.
	while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
		pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
	}
	// Master thread could wake us up without putting a socket.
	// If this happens, it is time to exit.
	if (ctx->stop_flag) {
		(void) pthread_mutex_unlock(&ctx->mutex);
		return 0;
	}
	assert(ctx->sq_head > ctx->sq_tail);

	// Copy socket from the queue and increment tail
	*sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
	ctx->sq_tail++;
	DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));

	// Wrap pointers if needed
	while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
		ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
		ctx->sq_head -= ARRAY_SIZE(ctx->queue);
	}

	(void) pthread_cond_signal(&ctx->sq_empty);
	(void) pthread_mutex_unlock(&ctx->mutex);

	return 1;
}

static void worker_thread(struct mg_context *ctx) {
	struct mg_connection *conn;
	int buf_size = atoi(ctx->config[MAX_REQUEST_SIZE]);

	conn = (mg_connection *)calloc(1, sizeof(*conn) + buf_size);
	conn->buf_size = buf_size;
	conn->buf = (char *) (conn + 1);
	assert(conn != NULL);

	while (ctx->stop_flag == 0 && consume_socket(ctx, &conn->client)) {
		conn->birth_time = time(NULL);
		conn->ctx = ctx;

		// Fill in IP, port info early so even if SSL setup below fails,
		// error handler would have the corresponding info.
		// Thanks to Johannes Winkelmann for the patch.
		conn->request_info.remote_port = ntohs(conn->client.rsa.u.sin.sin_port);
		memcpy(&conn->request_info.remote_ip,
			&conn->client.rsa.u.sin.sin_addr.s_addr, 4);
		conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
		conn->request_info.is_ssl = conn->client.is_ssl;

		if (!conn->client.is_ssl ||
			(conn->client.is_ssl && sslize(conn, SSL_accept))) {
				process_new_connection(conn);
		}

		close_connection(conn);
	}
	free(conn);

	// Signal master that we're done with connection and exiting
	(void) pthread_mutex_lock(&ctx->mutex);
	ctx->num_threads--;
	(void) pthread_cond_signal(&ctx->cond);
	assert(ctx->num_threads >= 0);
	(void) pthread_mutex_unlock(&ctx->mutex);

	DEBUG_TRACE(("exiting"));
}

// Master thread adds accepted socket to a queue
static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
	(void) pthread_mutex_lock(&ctx->mutex);

	// If the queue is full, wait
	while (ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
		(void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
	}
	assert(ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue));

	// Copy socket to the queue and increment head
	ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
	ctx->sq_head++;
	DEBUG_TRACE(("queued socket %d", sp->sock));

	(void) pthread_cond_signal(&ctx->sq_full);
	(void) pthread_mutex_unlock(&ctx->mutex);
}

static void accept_new_connection(const struct socket *listener,
struct mg_context *ctx) {
	struct socket accepted;
	int allowed;

	accepted.rsa.len = sizeof(accepted.rsa.u.sin);
	accepted.lsa = listener->lsa;
	accepted.sock = accept(listener->sock, &accepted.rsa.u.sa, &accepted.rsa.len);
	if (accepted.sock != INVALID_SOCKET) {
		allowed = check_acl(ctx, &accepted.rsa);
		if (allowed) {
			// Put accepted socket structure into the queue
			DEBUG_TRACE(("accepted socket %d", accepted.sock));
			accepted.is_ssl = listener->is_ssl;
			accepted.is_proxy = listener->is_proxy;
			produce_socket(ctx, &accepted);
		} else {
			cry(fc(ctx), "%s: %s is not allowed to connect",
				__func__, inet_ntoa(accepted.rsa.u.sin.sin_addr));
			(void) closesocket(accepted.sock);
		}
	}
}

static void master_thread(struct mg_context *ctx) {
	fd_set read_set;
	struct timeval tv;
	struct socket *sp;
	int max_fd;

	while (ctx->stop_flag == 0) {
		FD_ZERO(&read_set);
		max_fd = -1;

		// Add listening sockets to the read set
		for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) {
			add_to_set(sp->sock, &read_set, &max_fd);
		}

		tv.tv_sec = 1;
		tv.tv_usec = 0;

		if (select(max_fd + 1, &read_set, NULL, NULL, &tv) < 0) {
#ifdef _WIN32
			// On windows, if read_set and write_set are empty,
			// select() returns "Invalid parameter" error
			// (at least on my Windows XP Pro). So in this case, we sleep here.
			sleep(1);
#endif // _WIN32
		} else {
			for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) {
				if (FD_ISSET(sp->sock, &read_set)) {
					accept_new_connection(sp, ctx);
				}
			}
		}
	}
	DEBUG_TRACE(("stopping workers"));

	// Stop signal received: somebody called mg_stop. Quit.
	close_all_listening_sockets(ctx);

	// Wakeup workers that are waiting for connections to handle.
	pthread_cond_broadcast(&ctx->sq_full);

	// Wait until all threads finish
	(void) pthread_mutex_lock(&ctx->mutex);
	while (ctx->num_threads > 0) {
		(void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
	}
	(void) pthread_mutex_unlock(&ctx->mutex);

	// All threads exited, no sync is needed. Destroy mutex and condvars
	(void) pthread_mutex_destroy(&ctx->mutex);
	(void) pthread_cond_destroy(&ctx->cond);
	(void) pthread_cond_destroy(&ctx->sq_empty);
	(void) pthread_cond_destroy(&ctx->sq_full);

	// Signal mg_stop() that we're done
	ctx->stop_flag = 2;

	DEBUG_TRACE(("exiting"));
}

static void free_context(struct mg_context *ctx) {
	int i;

	// Deallocate config parameters
	for (i = 0; i < NUM_OPTIONS; i++) {
		if (ctx->config[i] != NULL)
			free(ctx->config[i]);
	}

	// Deallocate SSL context
	if (ctx->ssl_ctx != NULL) {
		SSL_CTX_free(ctx->ssl_ctx);
	}
#ifndef NO_SSL
	if (ssl_mutexes != NULL) {
		free(ssl_mutexes);
	}
#endif // !NO_SSL

	// Deallocate context itself
	free(ctx);
}

void mg_stop(struct mg_context *ctx) {
	ctx->stop_flag = 1;

	// Wait until mg_fini() stops
	while (ctx->stop_flag != 2) {
		(void) sleep(0);
	}
	free_context(ctx);

#if defined(_WIN32)
	(void) WSACleanup();
#endif // _WIN32
}


static void krento_close(struct mg_connection *conn,
						 const struct mg_request_info *ri) {
							 mg_printf(conn, "HTTP/1.1 %d XX\r\n"
								 "Connection: close\r\n\r\n", ri->status_code);
							 DWORD dwRecipients = BSM_APPLICATIONS;
							 BroadcastSystemMessage(BSF_IGNORECURRENTTASK | BSF_POSTMESSAGE, &dwRecipients, KrentoClose, 0, 0);
}

static void krento_hide(struct mg_connection *conn,
						const struct mg_request_info *ri) {
							mg_printf(conn, "HTTP/1.1 %d XX\r\n"
								"Connection: close\r\n\r\n", ri->status_code);
							DWORD dwRecipients = BSM_APPLICATIONS;
							BroadcastSystemMessage(BSF_IGNORECURRENTTASK | BSF_POSTMESSAGE, &dwRecipients, KrentoHide, 0, 0);
}

static void krento_show(struct mg_connection *conn,
						const struct mg_request_info *ri) {
							mg_printf(conn, "HTTP/1.1 %d XX\r\n"
								"Connection: close\r\n\r\n", ri->status_code);
							DWORD dwRecipients = BSM_APPLICATIONS;
							BroadcastSystemMessage(BSF_IGNORECURRENTTASK | BSF_POSTMESSAGE, &dwRecipients, KrentoShow, 0, 0);
}

static void krento_about(struct mg_connection *conn,
						 const struct mg_request_info *ri) {
							 mg_printf(conn, "HTTP/1.1 %d XX\r\n"
								 "Connection: close\r\n\r\n", ri->status_code);
							 DWORD dwRecipients = BSM_APPLICATIONS;
							 BroadcastSystemMessage(BSF_IGNORECURRENTTASK | BSF_POSTMESSAGE, &dwRecipients, KrentoAbout, 0, 0);
}

static const struct internal_config {
	enum mg_event event;
	const char *uri;
	void (*func)(struct mg_connection *, const struct mg_request_info *);
} internal_config[] = {
	{MG_NEW_REQUEST, "/krento/close", &krento_close},
	{MG_NEW_REQUEST, "/krento/hide", &krento_hide},
	{MG_NEW_REQUEST, "/krento/show", &krento_show},
	{MG_NEW_REQUEST, "/krento/about", &krento_about},
	{MG_NEW_REQUEST, NULL, NULL}
};

static void *callback(enum mg_event event,
struct mg_connection *conn,
	const struct mg_request_info *request_info) {
		int i;

		for (i = 0; internal_config[i].uri != NULL; i++) {
			if (event == internal_config[i].event &&
				(event == MG_HTTP_ERROR ||
				!strcmp(request_info->uri, internal_config[i].uri))) {
					internal_config[i].func(conn, request_info);
					return "processed";
			}
		}

		return NULL;
}

static char *sdup(const char *str) {
	char *p;
	if ((p = (char *)malloc(strlen(str) + 1)) != NULL) {
		strcpy(p, str);
	}
	return p;
}

BOOL WINAPI IsWindows7()
{
	OSVERSIONINFO osver;
	osver.dwOSVersionInfoSize = sizeof(osver);
	if (GetVersionEx(&osver))
		return (osver.dwMajorVersion == 6 && osver.dwMinorVersion == 1)? TRUE: FALSE;
	else
		return FALSE;
}

struct mg_context * kr_start(char *server_root, char *server_port)
{
	BOOL Win7 = IsWindows7();
	struct mg_context *ctx = NULL;

	KrentoShow = RegisterWindowMessage(L"krento_show");
	// allow our message to come in even if sent by lower privilege 
	// process
	if (Win7)
		ChangeWindowMessageFilter(KrentoShow, MSGFLT_ADD);

	KrentoHide = RegisterWindowMessage(L"krento_hide");
	if (Win7)
		ChangeWindowMessageFilter(KrentoHide, MSGFLT_ADD);

	KrentoAbout = RegisterWindowMessage(L"krento_about");
	if (Win7)
		ChangeWindowMessageFilter(KrentoAbout, MSGFLT_ADD);

	KrentoOptions = RegisterWindowMessage(L"krento_options");
	if (Win7)
		ChangeWindowMessageFilter(KrentoOptions, MSGFLT_ADD);

	KrentoClose = RegisterWindowMessage(L"krento_close");
	if (Win7)
		ChangeWindowMessageFilter(KrentoClose, MSGFLT_ADD);

	PulsarHide = RegisterWindowMessage(L"pulsar_hide");
	if (Win7)
		ChangeWindowMessageFilter(PulsarHide, MSGFLT_ADD);

	PulsarShow = RegisterWindowMessage(L"pulsar_show");
	if (Win7)
		ChangeWindowMessageFilter(PulsarShow, MSGFLT_ADD);

	KrentoHelp = RegisterWindowMessage(L"krento_help");
	if (Win7)
		ChangeWindowMessageFilter(KrentoHelp, MSGFLT_ADD);

	char *options[10];
	options[0] = "document_root";
	options[1] = sdup(server_root);
	options[2] = "listening_ports";
	options[3] = sdup(server_port);
	options[4] = NULL;


	try
	{
		ctx = mg_start(callback, (const char **)options);
	}
	catch (...)
	{
		ctx = NULL;
	}

	return ctx;
}

struct mg_context *mg_start(mg_callback_t user_callback, const char **options) {
	struct mg_context *ctx;
	const char *name, *value, *default_value;
	int i;

#if defined(_WIN32)
	WSADATA data;
	WSAStartup(MAKEWORD(2,2), &data);
#endif // _WIN32

	// Allocate context and initialize reasonable general case defaults.
	// TODO(lsm): do proper error handling here.
	ctx = (mg_context *)calloc(1, sizeof(*ctx));
	ctx->user_callback = user_callback;

	while (options && (name = *options++) != NULL) {
		if ((i = get_option_index(name)) == -1) {
			cry(fc(ctx), "Invalid option: %s", name);
			free_context(ctx);
			return NULL;
		} else if ((value = *options++) == NULL) {
			cry(fc(ctx), "%s: option value cannot be NULL", name);
			free_context(ctx);
			return NULL;
		}
		ctx->config[i] = mg_strdup(value);
		DEBUG_TRACE(("[%s] -> [%s]", name, value));
	}

	// Set default value if needed
	for (i = 0; config_options[i * ENTRIES_PER_CONFIG_OPTION] != NULL; i++) {
		default_value = config_options[i * ENTRIES_PER_CONFIG_OPTION + 2];
		if (ctx->config[i] == NULL && default_value != NULL) {
			ctx->config[i] = mg_strdup(default_value);
			DEBUG_TRACE(("Setting default: [%s] -> [%s]",
				config_options[i * ENTRIES_PER_CONFIG_OPTION + 1],
				default_value));
		}
	}

	// NOTE(lsm): order is important here. SSL certificates must
	// be initialized before listening ports. UID must be set last.
	if (!set_gpass_option(ctx) ||
#if !defined(NO_SSL)
		!set_ssl_option(ctx) ||
#endif
		!set_ports_option(ctx) ||
#if !defined(_WIN32)
		!set_uid_option(ctx) ||
#endif
		!set_acl_option(ctx)) {
			free_context(ctx);
			return NULL;
	}

#if !defined(_WIN32)
	// Ignore SIGPIPE signal, so if browser cancels the request, it
	// won't kill the whole process.
	(void) signal(SIGPIPE, SIG_IGN);
#endif // !_WIN32

	(void) pthread_mutex_init(&ctx->mutex, NULL);
	(void) pthread_cond_init(&ctx->cond, NULL);
	(void) pthread_cond_init(&ctx->sq_empty, NULL);
	(void) pthread_cond_init(&ctx->sq_full, NULL);

	// Start master (listening) thread
	start_thread(ctx, (mg_thread_func_t) master_thread, ctx);

	// Start worker threads
	for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
		if (start_thread(ctx, (mg_thread_func_t) worker_thread, ctx) != 0) {
			cry(fc(ctx), "Cannot start worker thread: %d", ERRNO);
		} else {
			ctx->num_threads++;
		}
	}

	return ctx;
}
